Blimp over United Nations' convoy in the Atlantic Ocean in 1943
"File No: W-CON-46-65729. June 16, 1943. Blimp over convoy--Sunset over the Atlantic finds another United Nations' convoy peacefully moving towards it destination. The rays of the setting sun highlight a U.S. Navy blimp hovering watchfully overhead, on the lookout for any sign of enemy submarines. The number of Allied convoys safely making the Atlantic crossing is steadily rising, as British and American destroyers and escort vessels take a heavy toll of enemy U-boats. - Official U.S. Navy Photograph." 16 June 1943