Aviation Technology Office

The United States ArmyAviation Technology Office (ATO), known as Flight Concepts Division (FCD) before 2017, is a component of the United States Army that provides discreet, sometimes clandestine helicopter aviation support primarily to Joint Special Operations Command. Originally known as SEASPRAY, it was a joint U.S. Armyspecial operations and CIA clandestine aviation unit established in 1981, and later integrated as the covered air component (E Squadron) of Delta Force.

The unit provides highly specialized flights for special operations forces during covert and clandestine missions, and also has a bleeding-edge development role, leading research in emerging technologies for Army aviation. Officially part of the U.S. Army Aviation Flight Test Directorate, the unit is located at Felker Army Airfield along the James River on Fort Eustis, and has been described as "the best of the very best" and "one of the most secretive U.S. military aviation units known to be in existence today."