Helicopter Sikorsky HH-60M Black Hawk Serial Register 10-20321 used by US Air Force USAF ,US Army Aviation Army. Aircraft history and location Aircraft History 10-20321 US Army Aviation US Army, to USAF US Air Force Sikorsky HH-60U USAF 2011, conv to HH-60U at Madison County Executive Airport in Meridianville, AL to Air Force Test Center (AFTC) Det.3 2016 still Send Updates Use APP to upload photo @ (optional) When Now? / / Send