"Jacob Beser, Eng '48: After "Fat Man" and "Little Boy": A Lifetime of No Regrets
[...] Beser served as radar countermeasures officer on both the Enola Gay and Bock's Car, the B-29 bombing missions that dropped atomic weapons on Hiroshima and Nagasaki on August 6 and August 9, 1945, respectively.
Prior to the bombing missions, the Baltimore native worked on the Manhattan Project and helped design the proximity fuse that served to detonate "Fat Man" and "Little Boy" before they hit the ground. Needless to say, Beser had a story to tell, and he wanted to tell it. However, cancer took his life in 1992. He was unable to complete a book project that he thought would set the story straight on both missions and on how he and the crew felt about their role in history. They had no regrets."