Keywords: Grumman XTB3F-1 Guardian at NAS Patuxent River in December 1949.jpg A U S Navy Grumman XTB3F-1S Guardian BuNo 90506 at the Naval Air Test Center Patuxent River Maryland USA on 21 December 1949 This version of the Grumman Guardian was later redesignated AF-2W Official U S Navy photo http //www history navy mil/our-collections/photography/numerical-list-of-images/nhhc-series/nh-series/NH-89000/NH-89666 html NH 89666 from the U S Navy http //www history navy mil Naval History and Heritage Command 1949-12-21 AF3 S J Nocera U S Navy PD-USGov-Military-Navy Grumman AF Guardian 1949 at Naval Air Station Patuxent River |