https://olive-drab.com/od_other_firearms_pistol_38cal.php
"Although superceded as the standard firearm, the .38 cal. pistols were widely employed by guards, CID, intelligence and counterintelligence operatives, Navy Shore Patrol, pilots and some officers. The 2-inch barrel weapons were used by CID and counterintelligence personnel, while the 4-inch barrel weapons were commonly used by aviators, guards, U.S. Marines and others."
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