I was part of that...
I started in 1982. Then most dpeartments issed only a department approved sidearm. Revolvers were simple and effective. Still are.
I always shot revolvers better anyway. Even that Ruger Security Six.
I moved to a different department in 1987 and we were issued S&W 66 4". Great guns. For a long time we had the option of a personal gun. I carried a Sig P22 for a while before going to a Colt 1911 stainless. We just had to qualify with both the Smith and our gun. Eventually the department changed Chiefs and he dictated a department gun. Ruger P90 and then Glock 22.
I never though much of the 9mm.