The OA-10 was the U.S. Army Air Forces' version of the PBY series flown extensively by the U.S. Navy during World War II. It was a twin-engine, parasol-mounted monoplane equipped with a flying boat hull, retractable tricycle landing gear and retractable wing-tip floats. The OA-10 operated primarily for air-sea rescue work ("DUMBO" missions) with the USAAF's Emergency Rescue Squadrons throughout WWII and for several years thereafter. During the war, OA-10 crews rescued hundreds of downed fliers.

The Brazilian Air Force was one of several Allied nations that received Catalinas during the war. It operated this Catalina in a variety of roles in the Amazon Basin until 1981. Flown to the museum in 1984, it was restored and painted as an OA-10A assigned to the 2nd Emergency Rescue Squadron in the Pacific Theater during WWII.