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JUNE 29, 1955: The first B-52 Stratofortress strategic bomber enters service with the 93rd Bombardment Wing at Castle Air Force Base. Designed as the primary airborne component of America’s strategic nuclear deterrent, the massive bomber had a wingspan of 185 feet and was powered by eight Pratt & Whitney engines, allowing it to carry 35 tons of payload at up to 650 miles per hour. Flown by a five-man crew, the B-52 dropped conventional weapons over North Vietnam during Operation Linebacker and on thousands of flights during Operations Desert Storm and Enduring Freedom. A total of 744 B-52s were built — with the last delivered in 1963 — and more than 70 are still in active service today, sharing the air with their more modern bomber descendants, the B-1B Lancer and B-2 Spirit.