When Can You Leave NDA? When Can You Leave NDA: The first thing that is to be noted is that the aspirants can join the military services of their own choice, but they do not have the freedom to leave the services whenever they want to. A candidate has to sign a bond before the commission. The bond clearly states that one has to serve the defence force for a minimum period since his or her commission. If they get a permanent commission, they have to serve a minimum of 20 years in the military. On the other hand, a