Defence careers: NDA, CDS, AFCAT and the SSB interview

Defence and Strategic Studies (BA) · Careers · free study notes for exams, placements and interviews

In short

Commissioned officer entry into the Indian Armed Forces runs through three written gates — the NDA examination (after 10+2, conducted by UPSC), the CDS examination (after graduation, UPSC) and the AFCAT (conducted by the Indian Air Force) — followed in every case by the five-day Services Selection Board (SSB) interview and a medical board. A Defence and Strategic Studies graduate is directly eligible for the NDA Army wing (any 10+2 stream), and for CDS IMA and OTA entries, which accept any bachelor's degree; the Navy and Air Force academy entries need Physics and Mathematics or an engineering degree. This topic is examined in university papers on national security, defence organisation and manpower policy, and it is the single most practical "careers" chapter for the stream. Beyond officer entry it covers Agnipath/Agniveer recruitment for other ranks, the Territorial Army, and para-military and Coast Guard alternatives. Exam patterns, age bands and vacancy numbers change with each notification, so the authoritative document is always the current UPSC/IAF notification in the *Employment News* and on upsc.gov.in or afcat.cdac.in.

Explained

1. The NDA examination (10+2 entry, all three services)

Conducted by UPSC twice a year — NDA & NA Examination (I) with the exam usually in April, and (II) usually in September; the same exam also fills the Indian Naval Academy Course (INAC) 10+2 B.Tech entry.
Eligibility: unmarried candidate; Army wing — 10+2 in any stream; Navy, Air Force wings and INAC — 10+2 with Physics, Chemistry and Mathematics. Nationality as per UPSC rules (Indian citizen, or Nepal/Bhutan subject, or specified categories of Tibetan refugee/person of Indian origin).
Age: about 16½ to 19½ years on the first day of the course month; the exact date band is printed in each notification.
Women have been admitted to the NDA since the 2022 courses, following the Supreme Court's interim order of 2021 in the *Kush Kalra* matter; all three wings are open.
Written pattern: Paper I Mathematics — 300 marks, 120 questions, 2½ hours; Paper II General Ability Test (GAT) — 600 marks, 2½ hours, made of English 200 marks and General Knowledge 400 marks (Physics, Chemistry, General Science, History and Freedom Struggle, Geography, Current Events). Total 900 marks, objective, with one-third negative marking.
Qualified candidates face the SSB (900 marks); the final all-India merit is written + SSB out of 1,800, subject to medical fitness and vacancies.
Training: 3 years at the National Defence Academy, Khadakwasla (Pune) with a BA/BSc/BCS/B.Tech degree (awarded through the affiliating university arrangement), then one year of pre-commission training at the IMA Dehradun (Army), INA Ezhimala (Navy) or AFA Dundigal, Hyderabad (Air Force) before a Permanent Commission.

2. The CDS examination (graduate entry)

Conducted by UPSC twice a year (CDS I and CDS II) for four academies:
IMA Dehradun — any degree; unmarried; age roughly 19–24; Permanent Commission.
INA Ezhimala (Executive branch) — normally an engineering degree; unmarried; age roughly 19–24.
AFA Hyderabad (Flying) — degree with Physics and Mathematics at 10+2, or an engineering degree; unmarried; age roughly 20–24 (upper limit relaxable for commercial pilot licence holders).
OTA Chennai (Officers Training Academy) — any degree; married candidates are eligible; age roughly 19–25; Short Service Commission. OTA has both a men's course and a women's (SSC Non-Technical) course.
Written pattern: for IMA/INA/AFA — English 100, General Knowledge 100, Elementary Mathematics 100 = 300 marks, each paper 2 hours; for OTA only English and GK = 200 marks (no mathematics paper). One-third negative marking.
SSB marks: 300 for IMA/INA/AFA, 200 for OTA, so the merit total matches the written total.
Final commissioning: Lieutenant (Army), Sub Lieutenant (Navy), Flying Officer (Air Force).

3. AFCAT and other Air Force / Navy / Army routes

AFCAT (Air Force Common Admission Test) is run by the IAF itself, twice a year (AFCAT 01 and 02 of each year, usually February and August), online, for Flying and Ground Duty (Technical and Non-Technical) branches — Permanent Commission for men in both the Flying and the Ground Duty branches, and Short Service Commission for women (and for men who opt for it).
AFCAT pattern: 100 questions, 300 marks, 2 hours — General Awareness, Verbal Ability in English, Numerical Ability, Reasoning and Military Aptitude. +3 for a correct answer, −1 for a wrong answer, nothing for unattempted.
EKT (Engineering Knowledge Test) — an additional 50 questions, 150 marks, 45 minutes, taken by Ground Duty (Technical) candidates only, in their engineering discipline.
Age: Flying 20–24 years (upper limit relaxed to 26 for valid CPL holders); Ground Duty branches 20–26. Flying branch candidates must be unmarried at entry up to the age of 25.
NCC Special Entry — holders of an NCC Air Wing Senior Division 'C' certificate may apply for the Flying branch without writing AFCAT, going straight to the AFSB.
Other Army entries: TES (10+2 Technical Entry Scheme) for PCM students, shortlisted on JEE (Main) performance; TGC (Technical Graduate Course) and SSC (Tech) for engineers without a written exam; JAG entry for law graduates (LLB with a prescribed percentage, shortlisted on CLAT PG score in recent cycles); ACC (Army Cadet College) for serving soldiers; Territorial Army officer entry (written exam plus SSB) for employed civilians serving part-time.
Navy: INET (Indian Navy Entrance Test) for several graduate/engineering branches, 10+2 B.Tech cadet entry via JEE (Main), and the CDS INA route. Indian Coast Guard (an armed force of the Union under the Ministry of Defence) recruits Assistant Commandants through its own stage-wise examination.
Agnipath / Agniveer (announced 2022) is the scheme for other ranks in all three services: an online Common Entrance Examination, then a physical fitness test and recruitment rally, then a four-year engagement, at the end of which up to 25 per cent may be selected for regular cadre service. Officer entry is unaffected by Agnipath.

4. The SSB interview — structure

A five-day, two-stage board at an Army Selection Centre (Kapurthala, Prayagraj, Bhopal, Bengaluru and others), a Naval Selection Board, or an Air Force Selection Board (AFSB) (Dehradun, Mysuru, Gandhinagar, Varanasi, Guwahati). Three independent assessors — the Interviewing Officer (IO), the Group Testing Officer (GTO) and the Psychologist — report separately and only pool views at the Conference.

Stage I (Day 1, screening):
- OIR (Officer Intelligence Rating) — two booklets of verbal and non-verbal reasoning, speed tests.
- PP&DT (Picture Perception and Description Test) — a hazy picture shown for about 30 seconds, about 4 minutes to note characters, mood, action and write a story, then narration and a group discussion to reach a common story.
- Result: screened in (stay) or screened out (return the same day). Roughly one candidate in four to five is screened in, varying by batch.
Stage II (Days 2–5):
- Psychological tests (Day 2): TAT — 11 pictures plus one blank slide, 30 seconds viewing and 4 minutes writing each; WAT — 60 words, 15 seconds each, write the first response; SRT — 60 real-life situations in 30 minutes; SD (Self Description) — five short paragraphs in about 15 minutes on what parents, friends, teachers/employer and the candidate think of themself, and what they wish to improve.
- GTO tasks (Days 2–3): Group Discussion (two topics), GPE/MPE (Group Planning Exercise on a model map), PGT (Progressive Group Task), HGT (Half Group Task), Individual Obstacles (10 obstacles, 3 minutes), Group Obstacle Race / Snake Race, Lecturette (3 minutes on a chosen topic), Command Task, Final Group Task.
- Personal Interview with the IO — built around the PIQ (Personal Information Questionnaire): family, education, marks, hobbies, games, NCC, positions of responsibility, service choice and reasons.
- Conference (last day): all assessors and the board president; recommended or not recommended. Recommended candidates are sent for a medical board at a military hospital, with the right of an Appeal Medical Board and a Review Medical Board if declared unfit.

5. Officer Like Qualities (OLQs) — the actual assessment standard

Fifteen OLQs grouped into four factors; the board assesses *potential to be trained*, not knowledge.

Factor I — Planning and Organising: effective intelligence, reasoning ability, organising ability, power of expression.
Factor II — Social Adjustment: social adaptability, cooperation, sense of responsibility.
Factor III — Social Effectiveness: initiative, self-confidence, speed of decision, ability to influence the group, liveliness.
Factor IV — Dynamic/Operational: determination, courage, stamina.
Assessment is holistic and consensual, not an arithmetic sum of task scores; consistency across the written psychological tests, observed group behaviour and the interview is what the board looks for.

6. Physical standards, service conditions and the legal frame

Physical: minimum height generally 157 cm (152 cm for women, with regional and service-specific relaxations); weight proportionate to height and age; chest expansion at least 5 cm; corrected vision and colour perception standards that are much stricter for Flying (additional leg length, thigh length and sitting-height limits apply to pilots). Exact limits are in the notification's medical annexure and are revised periodically.
Pay: cadets draw a stipend during training; on commissioning a Lieutenant is placed at Level 10 of the Defence Pay Matrix (entry ₹56,100) plus Military Service Pay (MSP) ₹15,500 for officers up to Brigadier, plus DA, and allowances such as HRA, Field Area, High Altitude, Siachen, Flying and Technical pay. DA has been above 50 per cent since January 2024, so HRA is 30/20/10 per cent for X/Y/Z cities and is revised half-yearly.
Service conditions: Permanent Commission (NDA, CDS IMA/INA/AFA, TES, TGC) versus Short Service Commission (OTA, AFCAT, SSC Tech) — typically 10 years extendable to 14, with options to apply for PC. Women officers are eligible for Permanent Commission in the Army following the Supreme Court's 2020 judgment in *Secretary, Ministry of Defence v. Babita Puniya*, and women serve as fighter pilots in the IAF.
Legal frame worth knowing for a DSS paper: the Army Act, 1950, Navy Act, 1957 and Air Force Act, 1950 govern discipline and courts martial; the Armed Forces Tribunal Act, 2007 created the AFT for service matters; Article 33 of the Constitution permits Parliament to restrict the fundamental rights of members of the armed forces; recruitment policy flows from the Ministry of Defence and the Department of Military Affairs, with the Chief of Defence Staff post created in 2019.
Taxation: the Income-tax Act, 2025 applies from 1 April 2026 (it replaced the 1961 Act and renumbered every section and form). The Agniveer Corpus Fund / Seva Nidhi receipt is exempt, and there is a deduction for the Agniveer's own contribution; gallantry-award pensions and, by departmental instruction, disability pension of invalided personnel are exempt. Quote the provision by name, since the section numbers are new.

Key points

NDA - UPSC, twice a year, after 10+2; Army wing any stream, Navy/Air Force need PCM; age about 16½–19½; open to women since 2022.
NDA marks - Mathematics 300 + GAT 600 (English 200 + GK 400) = 900, plus SSB 900 → merit out of 1,800.
CDS - UPSC, twice a year, after graduation; IMA/INA/AFA 300 marks in three papers, OTA only 200 marks (no mathematics).
OTA is the married-candidate and Short Service Commission route; IMA/INA/AFA require unmarried status and give Permanent Commission.
AFCAT - IAF's own test, twice a year, 100 questions / 300 marks, +3 / −1; EKT 150 marks extra only for Ground Duty (Technical).
Negative marking - one-third in UPSC defence papers; the break-even accuracy for guessing is exactly 25 per cent.
SSB is two-stage - Stage I screening (OIR + PP&DT) on Day 1; Stage II psychology, GTO and interview over the next three to four days.
Three independent assessors - IO, GTO and Psychologist, pooled only at the Conference; the output is recommended / not recommended, not a pass mark.
Psychological battery - TAT (11 + 1 blank), WAT (60 words, 15 s), SRT (60 situations, 30 min), Self Description (5 paragraphs).
GTO tasks - GD, GPE, PGT, HGT, Individual Obstacles (10 in 3 min), Command Task, Lecturette, Snake Race, Final Group Task.
15 OLQs in four factors - Planning and Organising, Social Adjustment, Social Effectiveness, Dynamic.
Recommendation is not selection - merit list, medical board (with Appeal and Review Medical Boards) and vacancies decide the final call-up.
NCC Air Wing Senior Div 'C' - direct AFSB for the IAF Flying branch without AFCAT.
Entries without a written exam - TGC, SSC(Tech), JAG, NCC Special Entry (Army); TES and Navy 10+2 B.Tech use JEE (Main) merit.
Agnipath - other-ranks scheme since 2022: CEE, then rally, then a four-year engagement with up to 25 per cent retained.
Pay on commissioning - Level 10 entry ₹56,100 + MSP ₹15,500 + DA and allowances; HRA 30/20/10 per cent as DA exceeds 50 per cent.
Key law - Army/Navy/Air Force Acts, Armed Forces Tribunal Act 2007, Article 33; *Babita Puniya* (2020) on women's Permanent Commission.
Patterns and age bands change - the current UPSC/IAF notification is the only authority for dates, vacancies and medical limits.

Formulas and examples

Net score with fractional negative marking: S = (c × m) − (w × m/k)
c = correct answers, w = wrong answers, m = marks per correct answer, k = penalty divisor (k = 3 for UPSC "one-third" marking). Units: marks.
Marks per question: m = (total paper marks) ÷ (number of questions)
Break-even accuracy for guessing: set c·m = w·m/k → w = k·c → accuracy = c/(c + w) = 1/(1 + k)
For k = 3 this is 25 per cent; for AFCAT (+3 / −1, i.e. k = 3) it is also 25 per cent.
NDA/CDS final merit: M = (written marks) + (SSB marks), maximum 1,800 for NDA, 600 for CDS (IMA/INA/AFA), 400 for CDS (OTA).
Age eligibility: date of birth must lie between the two cut-off dates printed in the notification, computed as (course commencement reference date − upper age) and (− lower age).

Example 1 — NDA net score. Mathematics: 120 questions, 300 marks → m = 300/120 = 2.50; penalty = 2.50/3 = 0.8333. A candidate attempts 90 and gets 68 right (22 wrong): S = 68 × 2.50 − 22 × 0.8333 = 170.00 − 18.33 = 151.67. GAT: 150 questions, 600 marks → m = 600/150 = 4.00; penalty = 1.3333. Attempts 130, 85 right (45 wrong): S = 85 × 4 − 45 × 1.3333 = 340.00 − 60.00 = 280.00. Written total = 151.67 + 280.00 = 431.67 / 900. (Recent NDA written cut-offs have generally fallen in the 300–360 band out of 900, but the figure is re-fixed every cycle.)

Example 2 — CDS English paper, and the cost of poor accuracy. 120 questions for 100 marks → m = 100/120 = 0.8333, penalty = 0.2778.

Candidate A attempts 100 with 70 correct: 70 × 0.8333 − 30 × 0.2778 = 58.33 − 8.33 = 50.00.
Candidate B attempts all 120 with the same 70 correct (50 wrong): 58.33 − 13.89 = 44.44.
Twenty extra guesses at 0 per cent accuracy cost 5.56 marks — the whole point of the 25 per cent break-even rule.

Example 3 — AFCAT score and EKT. AFCAT: 100 questions, +3 / −1. Attempts 80, correct 55, wrong 25: S = 55 × 3 − 25 × 1 = 165 − 25 = 140 / 300. If the same candidate takes the EKT (50 questions, 150 marks, so 3 marks each, −1 wrong) and gets 30 right of 40 attempted: 30 × 3 − 10 = 80 / 150. Both must separately clear the cut-offs announced for that cycle.

Example 4 — Agniveer four-year package (Agnipath, as announced in 2022).

Year	Monthly package	30% to Corpus Fund	In-hand	Government match
1	₹30,000	₹9,000	₹21,000	₹9,000
2	₹33,000	₹9,900	₹23,100	₹9,900
3	₹36,500	₹10,950	₹25,550	₹10,950
4	₹40,000	₹12,000	₹28,000	₹12,000

Own contribution over four years = 12 × (9,000 + 9,900 + 10,950 + 12,000) = 12 × 41,850 = ₹5,02,200; with the equal government share the Seva Nidhi ≈ ₹10,04,400, plus accrued interest, paid tax-free on exit.

Example 5 — first-month pay of a newly commissioned Lieutenant (illustrative). Basic ₹56,100 (Level 10 entry) + MSP ₹15,500 = ₹71,600 reckoned for DA. Taking DA at an illustrative 55 per cent (the rate is notified half-yearly): DA = 0.55 × 71,600 = ₹39,380. HRA in an X-class city at 30 per cent of basic = 0.30 × 56,100 = ₹16,830. Gross ≈ 56,100 + 15,500 + 39,380 + 16,830 = ₹1,27,810 before field, flying, technical or high-altitude allowances and before deductions.

	NDA	CDS (IMA/OTA)	AFCAT
Conducting body	UPSC	UPSC	Indian Air Force
Stage of study	After 10+2	After graduation	After graduation
Frequency	Twice a year	Twice a year	Twice a year
Written marks	900	300 (OTA 200)	300 (+EKT 150)
Negative marking	1/3	1/3	−1 of +3
Marriage	Not permitted	IMA no, OTA yes	Flying: unmarried to 25
Commission	Permanent	PC (IMA) / SSC (OTA)	Mostly SSC
Open to a BA (DSS) student	Army wing only	Yes — IMA and OTA	Ground Duty Non-Tech

Where it is used

Armed forces officer cadre: Army (Infantry, Artillery, Armoured, Engineers, Signals, ASC, AOC, EME, Intelligence Corps), Navy (Executive, Education, Logistics), Air Force (Flying, Administration, Logistics, Education, Accounts, Met).
Training institutions: NDA Khadakwasla, IMA Dehradun, OTA Chennai and Gaya, INA Ezhimala, AFA Dundigal, and the Defence Services Staff College — where DSS graduates also find instructional and research roles.
Allied uniformed services: Indian Coast Guard; the CAPFs recruited through the UPSC CAPF (Assistant Commandants) examination — CRPF, BSF, CISF, ITBP and SSB only — which also uses an interview/personality test and physical standards; and Assam Rifles, which is officered largely by deputation from the Army and does not fill Assistant Commandant posts through that examination.
Defence-adjacent civilian roles: MoD and Department of Military Affairs desks, Sainik Schools and RIMC faculty, NCC units, DRDO and defence PSU administration, and the growing private defence-industry and strategic-consulting sector.
Coaching, counselling and research: SSB preparation academies, Sainik School and Military School entrance coaching, and think-tanks such as IDSA (MP-IDSA), CLAWS, NMF and CAPS where DSS graduates work on defence manpower and recruitment policy.
Policy analysis questions in exams: evaluating Agnipath, women's induction, officer shortfall and the theatre-command reorganisation — all standard DSS answer topics drawn from this material.

Interview questions

Q: Which defence entries are open to a BA in Defence and Strategic Studies? A: NDA Army wing (any 10+2 stream), CDS for IMA and OTA, AFCAT Ground Duty (Non-Technical), Navy non-technical graduate entries, Territorial Army and CAPF; the INA Executive and AFA Flying routes need engineering or PCM at 10+2.
Q: What is the difference between NDA and CDS? A: NDA is a 10+2 entry leading to three years at the Academy plus a degree before pre-commission training; CDS is a graduate entry straight into IMA, INA, AFA or OTA with a shorter course.
Q: Why does the OTA paper have no mathematics? A: OTA commissions Short Service Commission officers from any discipline, so the notified pattern tests only English and General Knowledge, for 200 marks.
Q: How does one-third negative marking change answering strategy? A: Break-even accuracy is 1/(1+k) = 25 per cent, so a question is worth attempting only if you can eliminate at least one of four options; blind guessing is loss-making.
Q: What happens on Day 1 of the SSB? A: Stage I screening — the OIR reasoning tests followed by PP&DT, after which candidates are either screened in for Stage II or sent home the same day.
Q: Name the psychological tests and their timings. A: TAT (11 pictures plus one blank, 30 s viewing and 4 min writing each), WAT (60 words at 15 s each), SRT (60 situations in 30 min) and Self Description (five paragraphs in about 15 min).
Q: What are the four OLQ factors? A: Planning and Organising, Social Adjustment, Social Effectiveness, and the Dynamic factor — fifteen qualities in all, including effective intelligence, initiative, courage and stamina.
Q: Does being recommended at the SSB guarantee a commission? A: No — recommendation is followed by the all-India merit list, a medical board and the number of vacancies; many recommended candidates are not called up.
Q: What is the Command Task assessing? A: The candidate's ability to plan an obstacle, choose and brief subordinates, and lead under pressure — organising ability, self-confidence and the ability to influence the group.
Q: How does AFCAT differ in marking from UPSC papers? A: AFCAT awards +3 for a correct answer and deducts 1 for a wrong one, with EKT marked the same way; UPSC deducts one-third of the marks of the question.
Q: What is Agnipath, and does it affect officer entry? A: It is the four-year engagement scheme for other ranks introduced in 2022, with up to 25 per cent retained in the regular cadre; officer entries through NDA, CDS and AFCAT are unchanged.
Q: What legal remedy does a serving officer have against a service decision? A: The Armed Forces Tribunal, created by the Armed Forces Tribunal Act, 2007, hears service and court-martial appeals; Article 33 allows Parliament to restrict the fundamental rights of armed forces personnel.

Common mistakes

Quoting a single fixed age band or vacancy figure as permanent — both are re-notified each cycle, and the notification governs.
Assuming a BA student can sit any CDS entry; INA Executive and AFA Flying have degree and 10+2 subject conditions.
Confusing PP&DT (Stage I screening, group story) with TAT (Stage II psychological test, 12 slides written individually).
Treating the SSB as a knowledge interview and preparing only current affairs, while OLQs are assessed from the PIQ, group behaviour and consistency across three independent assessors.
Writing "selected at SSB" instead of "recommended" — and forgetting the medical board, merit list and vacancy filter that follow.
Attempting every question in a one-third-negative paper, which costs marks whenever accuracy on guessed items falls below 25 per cent.
Mixing up Permanent and Short Service Commission routes, or claiming women cannot get a Permanent Commission in the Army — they can, after the 2020 *Babita Puniya* judgment, and the NDA has admitted women since 2022.