AVR 661 is an R-1 type United States Air Force "crash boat", a boat used in air-sea rescues. It is 85 feet long and has two Packard Marine 4M-2500 engines of 1500 horse power. It has a top speed of 35 knots. The boat was armed with a twin .50 caliber machine gun, a 20 mm anti-aircraft gun and two depth charges. These types of boats were used to rescue aircraft crews at sea. The designation AVR was used for "Aircraft Rescue Vessel", so it was one of the small, fast craft, that were used for rescuing pilots from downed planes.