The ISP adopted the Mod 39 in 1967 with it finally getting out to the Troops in 1968. The adoption was due to the efforts of Sgt Louis Seman who was the head range officer for the dept. Salt Lake City PD soon followed when they adopted the 39.
The changes that resulted in the 39-2 were due to our range officers working with S&W to make improvements.
We carried the 39 and 39-2 until 1981 when we went to the 439. W then went to 459/469 but I can't recall the exact year. I was already carrying my personally owned 459 so when the ISP went to the 459 I stayed with my personal one since I'd had it tuned and it was a shooter. I went into plain clothes in 1988 and was issued a 469 so the swap to 459/469 came prior to 1988. In the early 90s we went to the 3rd gen S&W issuing 5904s to the uniforms and 6904 to those in plain clothes who wanted them.
In 1997-98 the director decided we were going to .40. We began testing various makes and models. When done we asked for bids from the top 3 contenders, SIG, S&W, and Glock. Glock's bid was 1/2 that of S&W and 1/4 the bid from SIG so we ended up going to Glock 22/23 in 1999 with the dept fully transitioned to Glock by 2000.

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183rd FBINA