In 1973, the headquarters of the U.S. Air Forces in Europe (USAFE) was relocated to Ramstein Air Base near Kaiserslautern. The Air Force moved most personnel out of Wiesbaden in 1975 as part of Operation Creek Swap, in which most Army facilities in Kaiserslautern were turned over to the Air Force, in exchange for the facilities at Wiesbaden. The 4th Brigade, 4th Infantry Division, was stationed at Wiesbaden in 1976 as part of "Brigade 76" until it was replaced by the 3d Corps Support Command and 12th Aviation Brigade in the mid-1980s. In the mid-1980s, the base served as a landing point for the F-117 "Nighthawk" "Stealth Fighter". Although not officially acknowledged by the Air Force until 1988, the F-117 became operational in 1983. The Wiesbaden Air Base would "go dark", turning off all airfield and perimeter lights, whenever "stealth" flights were landing or taking off. From 1975 to 1993, the air base was a joint Army/Air Force community. In 1993, Wiesbaden Air Base was officially renamed Wiesbaden Army Air Field (WAAF).