Just some observations.
First up I am a 40cal fan.

SEALS and 9mm makes sense. Universal military round so can get ammo anywhere in the world and if they really need stopping power then that's what their rifle/grenade launchers are for.

LEO's missing bad guys in gun fights. It is not so much range time they need it is simmunition in scenario based training they need. You can be the best target shooter in the world and the worst in a real world gun situation. They need to learn to control their emotions and reactions, many ,ore would then have better hit ratios regardless of what calibre they are shooting.