>>63880286 (OP)1: Navy paid for a good chunk of the movie
2: If the climax of the film was a group of C-130's flying at their maximum altitude (with a heavy escort of F-22's) and dropping a few hundred Rapid Dragon'd cruise missiles out the back from 2000km away it would have been pretty boring
3: Tom Cruises ego is at risk of collapsing under its own weight into a singularity, and he wanted to look as cool as he did back in the first film.