In the mid 70s our department said any .38 you can qualify with. Smith and Wesson revolvers mostly and generally 4 inch versions. I carried a Model 15 until I got a Model 66. Thumb break Jordan Border Patrol was optional, otherwise a similar model with a strap. 2 Six Round dump pouches for ammo although some of us had a speed loader in our pocket. There were a few officers carrying the bigger N-Frame .38s. Off duty, .38s, Smith or Colt. Still have both the revolvers. Department went to Smith and Wesson .45 Semi Autos in the 90s. Glocks now, like most other departments around these parts.