Watchful Sandy by Ivan Berryman. (AP)

Playing a crucial role in the Vietnam conflict, the HH.53 'Jolly Green Giant' helicopters flew frequent courageous missions deep into North Vietnam to rescue even single US aircrew that were known to be still alive, always supported by the capable A-1H Skyraiders - or Sandy's - whose long endurance and low-speed, low-altitude capability made it the ideal guardian for the helicopter missions.

Limited edition of 20 artist proofs.

Image size 16 inches x 12 inches (41cm x 31cm)