With regard to the Dallas PD post by @HCM, et. al.: Dallas PD has issued revolvers for a very long time. They've variously issued Model 10s, Model 15s and Model 64s (4" and 2"). Even though they did issue them, many, if not most of the personnel carried a personally owned revolver, with the calibers being from .38 Special, .357 Magnum (most popular), .41 Magnum, .44 Magnum, .44 Special and .45 Colt. In the late 80s/early 90s they mandated first 4" only revolvers in uniform and then made the entire department a .355/.357 bore service gun PD. They allowed the newly approved 9mm, .38 Special and .357 Magnum. As time progressed, the number of revolvers dropped off and during my last visit to the FTU, they said they had one revolver left in uniform service.
The officer killed in the aforementioned 1911 failure was A. D. Hallum #3660: https://www.odmp.org/officer/5959-of...n-duane-hallum