Crack the NDA Exam 2022 in Your First Attempt With Trishul Defence Academy National Defence Academy is a Tri Services Academy which makes Commissioned Officers in Army,Air Force and Navy. Its the Only Tri Services Academy in the World which Trains Army,Airforce and Navy Officers Together. To get into NDA one has to clear Following Steps:- 1.Clear Written Examination 2.Clear SSB Interviews 3.Clear Medicals 4.Get into All India Merit List To Clear these 4 Steps It Requires Hard Work,Correct Guidance, Consistency and Disciplined Routine.All India about 450 students Join National Defence Academy.Joining in NDA is twice a year:- 1.January 2.July