sentences:  "U-123" was laid down on 15 April 1939 at the AG Weser yard in Bremen as yard number 955.She was launched on 2 March 1940 and commissioned on 30 May, with "Kapitänleutnant" Karl-Heinz Moehle (Crew 30) in command.He was relieved on 19 May 1941 by "Kptlt."