Runners participate in the 9/11 Never Forget Memorial 5K at Langley Air Force Base, Va., Sept. 11, 2015. U.S. Air Force Airmen assigned to the Distributed Ground Station-1 hosted the event, giving members of Joint Base Langley-Eustis the opportunity to honor the historic day’s events. (U.S. Air Force photo by Airmen 1st Class Derek Seifert/ Released)

A U.S. Air Force Airman sings the national anthem before the 9/11 Never Forget Memorial 5K at Langley Air Force Base, Va., Sept. 11, 2015. The event was held to show respect to those affected by the terrorist attacks on Sept. 11, 2001. (U.S. Air Force photo by Airmen 1st Class Derek Seifert/Released)

U.S. Air Force Chaplain (Capt.) Michael Gorton, 497th Intelligence Surveillance and Reconnaissance Group, gives an invocation before the 9/11 Never Forget Memorial 5K at Langley Air Force Base, Va., Sept. 11, 2015. Almost 3,000 Americans lost their lives due to the terrorist attacks that took place 14 years ago, on Sept. 11, 2001. (U.S. Air Force photo Airmen 1st Class Derek Seifert/ Released)

U.S. Air Force Col. Timothy Haugh, 480th Intelligence Surveillance and Reconnaissance wing commander, gives the opening remarks during the 9/11 Never Forget Memorial 5K at Langley Air Force Base, Va., Sept. 11, 2015. During his speech, Haugh recounted the events and praised the first responders who assisted the day of the Sept. 11, 2001 terror attacks. (U.S. Air Force photo by Airmen 1st Class Derek Seifert/ Released)