Just one airframe, but a historically significant one at that. Very historical.
http://www.af.mil/news/story.asp?id=123093897
http://www.af.mil/news/story.asp?id=123093897
4/10/2008 - HURLBURT FIELD, Fla. (AFPN) -- MH-53 Pave Low helicopter tail number 68-10357 flew its final mission and last flight supporting special operations forces March 28 in Iraq after 38 years of service.
The helicopter was the lead command and control helicopter for a mission to rescue approximately 50 American prisoners of war from the Son Tay prison camp in North Vietnam in 1970, which became a significant event for Air Force special operations.