In '71, the Luftwaffe chose the F-4F as a replacement for its F-104G. The F-4F was a stripped-down and cheaper version of the F-4E, and contained much components that were manufactured in Germany. As part of the purchase, an agreement was made between Germany and the USA to conduct basic F-4 transition/instructor training with the 20th Tactical Fighter Training Squadron at George. Training at George ended on 5 Jun'92. This 635 was moved to iWittmund (Germany) in May'97. It is now in use as an instructional airframe at Neubrug since May 2001.