On the handgun aspect
Different tool for different jobs in the military
MPs use them same as any LE
We use them as a secondary in the event that your primary goes down - hence the transitions (drop / and draw)
we use them for CQB in small rooms / aircraft takedowns / bus takedowns
and correct - you cant easily transition military tactics and immediate action drills to the civilian world except in a very small specialized set of missions like hostage rescue.