“US Army Aviation Test Activity”, “M.F.45 9537”, 1964, Edwards Air Force Base California,

“US Army pilots, flying a turbine-powered Bell UH-1D Iroquois, have set 10 world helicopter records – breaking two Russian held marks. The fights were made by pilots of the US Army Aviation Test Activity, Edwards AFB, Calif. The record-setting operations were staged at Edwards and at the Fort Worth Tex., plant of the Bell Hellicopter Company over a three-week period ending Oct. 7.”