Aviation Gunnery Booklets: Machine Guns and Related Subjects USAAF WWII

This is a set of two original WWII-era booklets on Machine Guns (50 and 30 caliber) and related subjects, including sighting, harmonization, range estimation, and others. These were published by the Gunnery Division of the USAAF Pre-flight School at Santa Ana Army Base in California during the 1940's.  The booklets are 22 and 24 pages respectively.  These came to us from the estate of a B-17 flight instructor.