The CH-47 arose from a 1956 decision to replace the U.S. Army’s piston-engine helicopters with more powerful gas-turbine models. After a yearlong debate over mission requirements, the Army settled on two designs: a troop carrier, the Bell UH-1 Iroquois, soon nicknamed the Huey; and a heavy-lift helicopter, the Boeing-Vertol YHC1B, which first flew on Sept. 21, 1961, and became the CH-47 in 1962. The twin-rotor CH-47, named after Native Americans in the Pacific Northwest, proved stable, agile and fast during flight tests. Production began in late 1963 and deliveries to the 11th Air Assault Division started a year later.
The division, reflagged as the 1st Cavalry Division (Airmobile) in June 1965, deployed to Vietnam with three Chinook companies that September. Crews quickly learned to mount a 7.62 mm M60 machine…