Sikorsky UH-19B 51-3928 United States Air ForceThese are 1 72 scale decals for the Sikorsky UH 19B Chickasaw, serial 51 3928, assigned to the Air Force Helicopter School, United States Air Force a primary training helicopter from the institution responsible for producing the USAF's first generation of military helicopter pilots. The UH 19B Chickasaw was the USAF's utility transport variant of the Sikorsky S 55, powered by a nose mounted Pratt & Whitney R 1340 Wasp radial engine that gave the type