Dear Student,

NDA Stands for National Defence Academy, which is a premier joint training Institution and center of excellence for producing junior officers, for the Indian armed forces, and armed forces of friendly foreign countries. NDA imparts training to young men, who choose the Armed Forces as their career. The training equips the students with mental, moral and physical attributes required to cope with the challenges of the future battle field. They are given an intensive education in Science, Technology, Arts and Military subjects.

And there is no such theory as Bionary Theory. 

Hope it helps.

Do revert if you have any kind of query.

Good Luck.