https://airandspace.si.edu/collection-objects/sikorsky-jrs-1

This amphibious seaplane is the only aircraft in the Museum that was at Pearl Harbor, Hawaii, on December 7, 1941. Ten JRS-1s were at the U.S. naval base when the Japanese attacked during World War II. The Navy immediately sent these unarmed utility craft to search for the enemy fleet. The JRS-1 (used 1937-1944) is the military version of the Sikorsky S-43 "Baby Clipper."