The Joint Air Delivery Test and Evaluation Unit (JADTEU) is a tri-service unit is an Air Warfare Centre Unit located at RAF Brize Norton. Commanded by a Lieutenant Colonel, it has a combined strength of approximately 115 military personnel and civil servants. Its primary role is to conduct operational trials and evaluation and to develop the delivery by air of manpower, machines and materiel on behalf of sponsors. In addition it provides advice/recommendations to MOD sponsors, other government departments, civilian industry and foreign governments on all air transport matters. It received ISO 9001 accreditation in 1997, this a requirement of holding Design Approved Organisation Scheme approval.
The JADTEU traces its history to the Army's Airborne Forces Development Centre and the RAF's Airborne Forces Tactical Development Unit. The Joint Air Transport Establishment was formed in January 1968 to oversee the testing of aircraft and trialling of new techniques. It was renamed Joint Air Transport Evaluation Unit (JATEU) in 1998.