Photo essay: Airmen prepare a KC-135 for duty Published May 18, 2011 By John S. Swanson 127th Air Refueling Group Public Affairs SELFRIDGE AIR NATIONAL GUARD BASE, Mich. (AFNS) -- Members of the Michigan Air National Guard's 127th Air Refueling Group prepare a KC-135 Stratotanker for duty here April 14. View the slideshow.