My first county job I was partnered with our Chief Investigator. While getting settled at my new desk he asked what I'd be using for a gun, so I tell him a Model 19. I then asked what he was using, to which he replies "S&W Sport". I looked at him for a second, then asked "Um, the .22 pistol?". He proudly responded "Yep, head shots, always go for head shots". I smiled, while thinking that I needed to transfer as soon as I could.
Oh, the 22 Sport had replaced the Beretta he used to carry. The .25 Beretta.
Met two guys at firearms qual with Daewoo .40 pistols. They both needed new guns by the end of quals.
At a prison a few years ago I saw a nickel .38 Hand Ejector still in use. I asked to look at it, cartridges had turned green.
Not LEO, but unusual. In 2nd grade my class walked around town to different businesses to learn about careers. One stop was the local tire shop, where the counter man carried a Browning Hi Power in a shoulder holster (it wasn't a great neighborhood). He politely answered all our questions, including the ones from my friends and I about the Browning. When the teacher asked at the end of the day what jobs we might like when we grew up my friends and I all said we wanted to work at the tire store. The teacher, confused, asked why. "You get to carry a big gun!" we all replied.