In 1938, the Air Corps reorganized its support units and the 66th was consolidated with the Station Complement, Nichols Field as the Base Headquarters and 20th Air Base Squadron. In the fall of 1940, air base squadrons expanded into groups and were assigned materiel squadrons for maintaining aircraft and air base squadrons to provide administrative support, and the unit became the 20th Air Base Group.
In 1938 the Air Corps reorganized its support units and the 66th was consolidated with the Station Complement, Nichols Field as the Base Headquarters and 20th Air Base Squadron. In the fall of 1940, air base squadrons expanded into groups and were assigned materiel squadrons for maintaining aircraft and air base squadrons to provide administrative support, and the unit became the 20th Air Base Group.