The first residents of the airfield was the 10th Reconnaissance Group which arrived from Key Field, Mississippi in January 1944.
The group consisted of the following operational squadrons:
15th Tactical Reconnaissance Squadron
30th Photographic Reconnaissance
31st Photographic Reconnaissance
33rd Photographic Reconnaissance
34th Photographic Reconnaissance
423d/155th Photographic Reconnaissance
The 30th Photographic Reconnaissance Squadron (PRS) arrived in January and early February.
The 31st, 33rd and 34th PRS became operational at Chalgrove in April.

The primary aircraft flown by the group consisted of photographic versions of the Lockheed P-38 Lightning (F-5) and North American P-51 Mustang (F-6).
In addition, the unit also flew the Stinson L-1 Vigilant and L-5 Sentinel along with the Piper L-4 Grasshopper light observation aircraft.

In May 1944 the 30th PRS moved to RAF Middle Wallop and it was replaced by the 423rd Night Fighter Squadron with Douglas A-20 Havoc (F-3A) from RAF Charmy Down which was used for night photo-reconnaissance.
In June the 423d was renamed the 155th Photo Reconnaissance Squadron.

After the invasion, the 15th TPRS moved into France first, to the Advanced Landing Ground at Rennes - St-Jacques, France (ALG A-27) on 10 July.
The other squadrons of the 10th moved over the next few weeks, the last being the 155th which moved to France in mid-August.
The first residents of the airfield was the 10th Reconnaissance Group which arrived from Key Field, Mississippi in January 1944. The group consisted of the following operational squadrons:
15th Tactical Reconnaissance Squadron
30th Photographic Reconnaissance
31st Photographic Reconnaissance
33rd Photographic Reconnaissance
34th Photographic Reconnaissance
423d/155th Photographic Reconnaissance
The 30th Photographic Reconnaissance Squadron (PRS) arrived in January and early February. The 31st, 33rd and 34th PRS became operational at Chalgrove in April.
The primary aircraft flown by the group consisted of photographic versions of the Lockheed P-38 Lightning (F-5) and North American P-51 Mustang (F-6). In addition, the unit also flew the Stinson L-1 Vigilant and L-5 Sentinel along with the Piper L-4 Grasshopper light observation aircraft.
In May 1944 the 30th PRS moved to RAF Middle Wallop and it was replaced by the 423rd Night Fighter Squadron with Douglas A-20 Havoc (F-3A) from RAF Charmy Down which was used for night photo-reconnaissance. In June the 423d was renamed the 155th Photo Reconnaissance Squadron.
After the invasion, the 15th TPRS moved into France first, to the Advanced Landing Ground at Rennes - St-Jacques, France (ALG A-27) on 10 July. The other squadrons of the 10th moved over the next few weeks, the last being the 155th which moved to France in mid-August.
Chalgrove Airfield