National Geographic : 1939 Dec
Photograph by Ralph Kestly TENTS FOR THE "WATCHDOGS" OF THE CARIBBEAN MARK THE START OF A NEW NAVAL AIR BASE AT SAN JUAN Old Spanish fortifications and a modern American skyline look down on the Isla Grande headquarters of the Neutrality Patrol. Seven ofthetwelve flying boats assigned to Puerto Rico are drawn up back of the hangar. Daily they patrol the Caribbean area. Across the harbor thecruisers Tuscaloosa and San Francisco aredocked.