Boeing B-52G 'Stratofortress' (464) AF Serial: 58-0216. 42 BW, 464285 "Thunder Struck" 42nd BW, Loring AFB, Maine.
In the rear fuselage, a tail turret with four 0.50 inch (12.7 mm) machine guns with a fire-control system. [wiki]
Photographed on Sunday, August 30, 1992 at the Grand Forks Air Force Base.