books.google.co.uk - Osprey's study of AH-1 helicopters and their participation in the Vietnam War (1955-1975). Bell's AH-1 Cobra was the first dedicated helicopter gunship to reach frontline service anywhere in the world. Developed as a private venture by the manufacturer, and based on the mechanics of the ubiquitous UH-1...http://books.google.co.uk/books/about/US_Army_AH_1_Cobra_Units_in_Vietnam.html?id=ohIPlw5yitwC&utm_source=gb-gplus-shareUS Army AH-1 Cobra Units in Vietnam
