![]() The Helio HST-550 Stallion was an STOL utility aircraft developed in the United States in 1963, with the first prototype flying in July 1964. A total of 20 were built during the Vietnam War, with most of the aircraft being later sold to the Khmer Air Force. The Helio AU-24 Stallion was an American armed gunship, counter-insurgency, and utility transport developed for the United States Air Force. Helio AU-24A Stallion in storage at Davis-Monthan AFB, July 1972, prior to its delivery to the Khmer Air Force.Īrmed gunship, counter-insurgency, utility transport JSTOR ( March 2016) ( Learn how and when to remove this template message).Find sources: "Helio AU-24 Stallion" – news Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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