Operation Teardrop was a United States Navy operation during World War II, conducted between April and May 1945, to sink German U-boats approaching the Eastern Seaboard that were believed to be armed with V-1 flying bombs. Germany had threatened to attack New York with V-1 flying bombs and rocket U-boats. After the war, it was determined the submarines had not been carrying either.

German submarine U-546 was a Type IXC/40 U-boat operated by Nazi Germany's Kriegsmarine during World War II. She was laid down at the Deutsche Werft in Hamburg as yard number 367 on 6 August 1942, launched on 17 March 1943 and commissioned on 2 June 1943 under Oberleutnant zur See Paul Just. The U-boat was a member of three wolfpacks.