seriously, an AF Captain won the 2003 Marine Corps Marathon, and the AF had many other top finishers that year...
http://www.af.mil/news/airman/0203/world4.html
and they also have their own marathon [they just held the 9th one on Sept 17, the birthday of the AF] it’s just held at wright patterson afb in dayton ohio, so you don’t see them gracing the streets of our nation’s capitol!
http://www.af.mil/news/story.asp?storyID=123011843
but my favorite, in the spirit of expeditionary air forces, they even held a 10-miler at Balad AB Iraq last october. don’t know if they’ll do that again this year or not...
http://www.af.mil/news/story.asp?storyID=123009017
michelle g