We just used the same ones the .45 had, updated in nylon.
Keep in mind your MOS determines your weapon, the average soldier doesn't automatically get a service pistol, and a lot of times as the mission requirements dictate, you get an M16A- or M4.
As an MP, you could get almost any Infantry weapon up to M2 or M17 on a pintle mount. The average MP squad is more heavily armed than an Infantry squad, and when you do Area Guard or securing a checkpoint, you become a battle station. Death Blossom is a reality out in the middle of nowhere at a road junction. In modern warfare, a "front line" is a Hollywood anachronism.
At a front gate in Conus, black issue leather no cord was our mode. Field cap and armband. After about two weeks most of us had our own stuff scoured from flea markets, mail order or pawn shops. Still have most of it. That means a lot of gear used during modern conflicts these days is commercial off the shelf, and likely paid out of pocket, too. That's been happening since, well, soldiers went into the field.