Code Two (1953)

Chuck O'Flair and two buddies, Russ Hartley and Harry Whenlon, enter the Los Angeles Police Academy as cadets. Cocky and sure of himself, O'Flair almost gets washed out as unfit material. After they graduate, one of them accidentally stumbles on a gang of black marketeers and is murdered. O'Flair requests the assignment to track down the killer.