Pima County sheriff's Department, Arizona
Believe it or not, my department allows a wide range of duty options. The Glock 17 (9MM) are issue. SWAT gets the .357 SIG version of the Glock.
The Springfield M1911A1 (.45), Colt Ser 80 (.45), ParaOrd (.45) and some H&K, and SIGS are allowed as options. Buy your own.
We use Hydra-Shock loads for the 9MM & .45. I forget what load is used for the .357 SIG.
I've carried a M1911A1 type for 20 years in the Marine Corps and now for 16 years with the department. Currently I carry a SS M1911A1 .45 ACP Springfield that has been "tuned up". It is a real good shooter. If you miss, it's YOUR falt! Not the pistol.
Clem