Training Booklets, Set of 3: Upper, Lower Ball, and Tail Turrets A4 Skyhawk His exploits can be read

His exploits can be read in his autobiographical account From Coastal Command to Captivity

The Mark 18 sight was used in some turrets of US Navy aircraft as well as in the cockpit of the Korean War-era F-86 Sabrejet fighter

and the speed indicator switched to the encoder on the engine

It has a date of manufacture stamped June 1952

The assembly itself is ~3

Training Booklets, Set of 3: Upper, Lower Ball, and Tail Turrets A4 Skyhawk His exploits can be readThis listing is for a set of 3 original WWII era armorer training booklets for gun turrets used in the heavy bombers B 17 and B 24 compiled by the Air Forces Technical School, 2nd Echelon Power Operated gun Turret Division, Lowery Field Colorado, February 1943. Includes: 1) Sperry Upper Turret, 13 pages 2) Sperry Lower Ball Turret, 11 pages 3) Consolidated Tail Turret, 14 pages Each booklet reviews turret installation, service, maintenance,