The B-45A has a convention tail gunner position because the radar-directed defensive fire control system that was originally planned was not yet available. The B-45B was a proposed variant of the B-45A that would offer new radar and fire-control systems. The B-45B never reached production.
Sources:
- Post-World War II Bombers, Marcelle Size Knaack, Office of Air Force History, 1988.
