Medical Group chief retires after more than 37 years of service Published June 9, 2014 By Senior Master Sgt. Robert Wade 349th Public Affairs TRAVIS AIR FORCE BASE, Calif. -- The retirement ceremony for Chief Master Sgt. Mark Kloeppel, 349th Medical Group, was held June 8 in the David Grant USAF Medical Center auditorium. Kloeppel's ceremony was officated by Col. (Dr.) Kurt P. Lambert, Commander of the 349th Medical Group. Kloeppel served the United States Air Force for more than 37 years.