USAAF Station Units assigned to RAF Chipping Ongar were:[1] Parts of the airfield were still under construction when the 387th Bombardment Group (Medium) arrived from Goodman AAF, Kentucky on 25 June 1943.

The 387th Bomb Group moved to RAF Stoney Cross in Hampshire on 21 July 1944 when Ninth Air Force moved the 98th Bomb Wing's four Marauder groups into the New Forest area at the earliest opportunity to place them closer to the French Normandy Invasion beaches.

During September 1944, the airfield was used temporarily by IX Troop Carrier Command as advanced C-47 base during Operation Market-Garden.

They established a branch of the Home Counties Flying Club here, and Straight Aviation Training Ltd operated a fleet of Avro Anson navigation trainers here from 1946 to 1948.

On the northeastern side, the Operations block, Norden Bombsight Store, and the base of the pilots' briefing room are grouped together, and are in quite good condition 51°43′53″N 000°18′09″E / 51.73139°N 0.30250°E / 51.73139; 0.30250.