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1st Lt. Richard J. Trockman, Evansville, Indiana, at the escape hatch of a low pressure chamber. This chamber is in use by the U.S. Air Force, Headquarters 8th Air Force Provisional Medical Field Service School, High Wycombe, England and is for the purpose of testing the airmen’s general physical condition. 24 Feb 1943 (Photo courtesy of the National Archives)
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