Keywords: Mars4inflight (4448922352).jpg Four Martin JRM Mars aircraft Philippine Mars BuNo 76820 Marianas Mars BuNo 76821 Hawaii Mars BuNo 76823 and Caroline Mars BuNo 76824 of U S Navy transport squadron VR-2 in flight Official U S Navy photo http //www history navy mil/our-collections/photography/numerical-list-of-images/nhhc-series/nh-series/NH-70000/NH-70215 html NH 70215 from the U S Navy http //www history navy mil Naval History and Heritage Command U S Navy USN thumb left PD-USGov-Military-Navy Martin JRM Mars Philippine Mars US Navy Hawaii Mars US Navy |