Hii!
It would be better for us to answer your question if you provide the name of the place where you seek admission in St Marie's college, because there are many Colleges of the same name at different locations. Usually, St Marie's colleges provide NCC as an option to candidates. The wing of NCC, that is, Air force, Army or Navy may differ in different colleges. Thus, please restructure your question and ask again including the necessary details.
Hope you understand.
Good luck!