The 501 CSW currently oversees and supports four Air Base Groups operating a total of eleven installations and operating locations in the U.K. and Norway; the 420th Air Base Group at Royal Air Force (RAF) Fairford and RAF Welford; the 421st Air Base Group at RAF Menwith Hill; the 422d Air Base Group at RAF Croughton; and the 423d Air Base Group at RAF Alconbury, including RAF Molesworth, RAF Upwood and Sola Air Station (what the USAF calls Stavanger Air Base) in Norway. The 501st CSW also serves as the administrative agent for NATO in the U.K.