As KC-135Es retire, Air Force officials' focus shifts to KC-X

http://www.af.mil/news/story.asp?id=123171172

10/5/2009 - SCOTT AIR FORCE BASE, Ill. (AFNS) -- One of the last of
the KC-135E Stratotankers to retire made its final flight Sept. 28 to
Sheppard Air Force Base, Texas, and after more than 50 years of
service, tail number 56-1503 will be relegated to a life as one of
several planes used for aircraft maintenance training on the base.