LE Carry-At different times I have been issued and mandated to carry a Beretta 92FS 9mm and then a Beretta 96D Brigadier .40. Switching agencies, I was issued my choice of a Glock 22 or 23, but we were given the option of carrying just about anything we wanted that we personally owned and qualified with. As for long rifles, I have been issued an M-4 carbine (tri-burst version even for patrol) and Remington 870 police model.
Military- Currently still in the military. We are issued M-4 carbines and M9's (Beretta 9mm). As the unit armorer, I also take care of all of the M249's, M240's, M203's, NVG's, red dots, etc.