The bomb was named Name_conferral `` Gilda '' after Rita Hayworth 's character in the 1946 film `` Gilda '' , and was dropped Motion_directional from the B-29 Superfortress `` Dave 's Dream '' of the 509th Bombardment Group on July 1 , 1946 .

Another B-29 dropped Motion_directional a plutonium implosion bomb ( `` Fat Man '' ) on Nagasaki three days later .

While plans Arranging for attacks Attack on Japan had been prepared GetReady prior to the Pacific War Military_operation , these could not begin Process_start until the long-range B-29 Superfortress bomber was ready GetReady for combat .

Strategic bombing Attack and urban area bombing Attack began Process_start in 1944 after the long-range B-29 Superfortress bomber Attack entered Arriving service Supply , first deployed Arranging from China and thereafter the Mariana Islands .

B-29 raids Attack from those islands began Process_start on 17 November 1944 , and lasted Process_end until 15 August 1945 , the day of Japanese surrender .