Ex-servicemen get reserved vacancies in central government Group C and some Group B posts as per government policy. They also get age relaxation and, in some exams, relaxation in the written test standards. To claim the benefit you must be an ex-serviceman as defined in the official rules and produce the discharge certificate. The exact quota percentage and relaxation are given in each recruitment notification. Ex-servicemen should also check the re-employment rules that apply after joining.