First responders from RAF Mildenhall and RAF Lakenheath lower the U.S. flag during a 9/11 memorial retreat ceremony Sept. 11, 2014, on RAF Mildenhall, England. This year marks the 13th anniversary of the attacks on the World Trade Center in New York City. (U.S. Air Force photo/Karen Abeyasekere/Released)
RAF Mildenhall and RAF Lakenheath first responders carry the U.S. flag and Royal Air Force ensign to present to U.S. Air Force Col. Kenneth T. Bibb Jr., 100th Air Refueling Wing commander, during a 9/11 memorial retreat ceremony Sept. 11, 2014, on RAF Mildenhall, England. This year marks the 13th anniversary of the attacks on the World Trade Center in New York City. (U.S. Air Force photo/Karen Abeyasekere/Released)
Firefighters from the 100th Civil Engineer Squadron and the 48th CES Fire Departments participate in a 9/11 memorial retreat ceremony Sept. 11, 2014, on RAF Mildenhall, England. This year marked the 13th anniversary of the attacks on the World Trade Center in New York City. (U.S. Air Force photo/Senior Airman Victoria H. Taylor/Released)