Complete comparison of NDA (12th pass, 16.5-19.5 years) and CDS (graduate, 19-25 years). NDA training is 3 years at National Defence Academy, Khadakwasla. CDS training is 18 months at Officers Training Academy. Both lead to Commissioned Officer rank. SSB Interview is common for both — covers Screening Test, Psychology Tests, Group Testing Officer tasks, and Conference. Career path includes Lieutenant → Captain → Major → Colonel → Brigadier → General ranks.