The Bell UH-1 Iroquois (nicknamed "Huey") is a military helicopter powered by a single turboshaft engine, with two-blade main and tail rotors. The first member of the prolific Huey family, it was developed by Bell Helicopter to meet a United States Army's 1952 requirement for a medical evacuation and utility helicopter, and first flew in 1956. The UH-1 was the first turbine-powered helicopter to enter production for the United States military, in 1960, and more than 16,000 have since been built.