Defence · where it leads

What a career in the armed forces actually leads to

Most people picture the uniform and the parade. Some of the work is that, for a few days a year. The rest is training people, maintaining equipment, writing and reading orders, and long postings in places you did not choose — punctuated, for some, by the thing the whole institution exists for. This is what the work is, what it costs, and who tends to find it bearable, written so that deciding against it counts as the page working.

The odds, before anything else. In NDA (Written + SSB) 2025, people sat the exam for 406 seats. The full figures, with sources →

How you actually get there

When	What	What it means
After Class 12, within a narrow age window	The academy route — a degree read in uniform, then a commission	The door this catalogue covers. You enter straight from school, take a degree at a service academy, and are commissioned after it. The written paper is the first filter and by a distance the smallest: a days-long selection board and a medical board follow it, and between them they turn away far more candidates than the exam does. Anyone planning for this should plan for those, not for the paper.
After a bachelor's degree	The graduate entries, direct to a commission	The other door, and the one people forget while they are still in school. Every service runs graduate entries with their own age windows and their own selection, so missing the school-leaving window is not the end of this route. None of those entrances is in this catalogue yet.

There is no professional register here and no licence to lose, which makes this look like engineering — and it is nothing like engineering. You are commissioned, which is a legal status rather than a qualification: it places you under a separate body of law with its own courts and its own offences, some of which have no civilian equivalent. The gate is not something you pass and keep. It is a condition you live under for as long as you serve.

What you can qualify with

Physics and Mathematics for the flying and naval branches — open to PCM, PCB, PCMB, Commerce, Arts.

Any stream can sit the exam, but not every stream can enter every branch: the air force and navy entries need Physics and Mathematics at Class 11 and 12, and the army entry does not. So the Class 10 choice does not close this field, and it can close part of it — which is a distinction worth making at fifteen rather than at eighteen.

Four working lives in uniform

Branch	Decided	What the days are	Why anyone does it	Money	Who it suits
Combat arms	at entry, and largely irreversibly	Training, inspections, administration and long periods of preparation for something that may not come. Postings are decided for you and frequently far from anywhere you know. The responsibility is unlike any other job available at twenty-two: people's lives are administratively yours.	Very few careers hand someone that young a real command, and none hands them one where the stakes are what they are here. If that is the appeal, it is a real one.	Structured, published and predictable, with allowances that vary sharply by where you are posted. It is not why anyone does this and it is not poor — and the pension arrangements matter more to the total than the salary does, which is unusual enough to be worth understanding early.	People who can decide with incomplete information and carry the result, and who are steadier than the people around them when things go wrong.
Technical and engineering branches	at entry, by branch and by stream	Maintenance, diagnosis and improvisation, often with the equipment that is available rather than the equipment that is wanted. Closer to civilian engineering than the other rows, and separated from it by consequence and by the absence of a supplier to call.	You keep things working that people depend on absolutely, and you find out quickly whether you can do that under pressure. The skills also travel, which few things in this field do.	As the services' scales set it, with the same posting-linked variation. Leaving later for civilian engineering is genuinely possible here and much harder from the other rows.	People who like fixing things and can accept that the specification was written by somebody else for a situation you are not in.
Medical, education and the support services A professional qualification first, then a service entry.	mostly after a professional qualification, so not at seventeen	Recognisably the civilian profession, done for a single employer under military law, with postings you do not choose. A doctor here practises medicine; the difference is where, and for whom, and under what obligation.	The profession plus the institution, for people who want both and would find either alone insufficient.	Comparable to public-sector civilian equivalents, and usually below the private ceiling of the same profession. Security and the pension are the trade.	People already committed to a profession who want to practise it somewhere that asks more of them than a hospital or a firm would.
What comes after	not at entry, and worth thinking about at entry anyway	Corporate roles, public sector, consulting, teaching, or a business. Former officers are recruited for judgement and for handling people rather than for technical currency, which is a real advantage and a narrower one than it sounds.	A career that ends while you are still young is unusual, and it can be an opportunity rather than a loss — but only for people who saw it coming.	Wide, and strongly dependent on what was built during service. A pension underneath it changes the arithmetic of taking risks afterwards.	Everyone here eventually, which is why this row exists at all. A page that stopped at the uniform would be describing half a working life.

What it costs

Cost	What that means in practice
The exam is the smallest filter	Clearing the written paper puts you in front of a days-long selection board and then a medical board, and between them they turn away far more people than the paper does. Preparation aimed only at the paper is preparation for the easy part — and the selection board is looking for things that cannot be revised for in a month.
A medical standard you do not control	Eyesight, hearing, height, weight and conditions you may not know you have can end this route at the board, after everything else has gone right. It is the one gate on this site that effort cannot move, and anyone building a single plan around this field should know that before they build it.
You do not choose where you live	Postings are decided for you, change every few years, and include places with little around them. That shapes friendships, a partner's career and a child's schooling for as long as you serve, and it is the cost most often described by families rather than by the person who joined.
Leaving is not like resigning	You are committed for a period fixed at entry, and release before it is not a resignation you hand in. Read those terms while choosing rather than while regretting; no other field on this site asks a seventeen-year-old for anything comparable.
The thing the institution exists for	This is the only career on this site where the work may require you to kill, or to be killed, and where families carry the possibility for years at a time. Most who serve never face it. It is not a small print for the ones who do, and a page that buried it would be selling something rather than describing it.

If you felt resistance, that counts. This field is chosen young, admired loudly, and understood late. If you read the costs and felt recognition, that is worth something. If what appeals is how it sounds when described to other people, that is worth naming now — because this is the one route here where changing your mind after entry is not simply a matter of leaving.

NDA (Written + SSB): dates, eligibility and the real denominators →

Everything above is judgement, not data. It cites no document and no checked date, unlike the exam pages — and the exam page for this field is itself frank that its one figure is the weakest citation on the site.