Service members join in a circle in memory of the six Airmen who were killed in late December while conducting counter-threat operations outside of Bagram Air Base, Afghanistan, Jan. 8, 2016, at Andersen Air Force Base, Guam. In honor of the four Air Force Office of Special Investigations special agents and two security forces members who were killed in Afghanistan, a 6K memorial run was held, with every kilometer representing one of the Airmen who was killed. (Courtesy photo)

Lt. Col. Glenn Gresham, 36th Wing chaplain, leads service members in a prayer before a memorial 6K Jan. 8, 2016, at Andersen Air Force Base, Guam. Air Force Office of Special Investigations Det. 602, 36th Security Forces Squadron and 736th SFS hosted a 6K memorial run to honor the four AFOSI special agents and two security forces members who were killed by a motorcycle-borne improvised explosive device on Dec. 21, 2015, outside of Bagram Air Base, Afghanistan. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)

Service members pause for a moment of silence before a memorial 6K Jan. 8, 2016, at Andersen Air Force Base, Guam. Air Force Office of Special Investigations Det. 602, 36th Security Forces Squadron and 736th SFS hosted a 6K memorial run to honor the four AFOSI special agents and two security forces members who were killed by a motorcycle-borne improvised explosive device on Dec. 21, 2015, outside of Bagram Air Base, Afghanistan. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)

Security Forces members stand in formation before a memorial 6K Jan. 8, 2016, at Andersen Air Force Base, Guam. Air Force Office of Special Investigations Det. 602, 36th Security Forces Squadron and 736th SFS hosted a 6K memorial run to honor the four AFOSI special agents and two security forces members who were killed by a motorcycle-borne improvised explosive device on Dec. 21, 2015, outside of Bagram Air Base, Afghanistan. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)

Service members conduct a ruck march during the 6K memorial run Jan. 8, 2016, at Andersen Air Force Base, Guam. Service members ran six kilometers to represent the six Airmen who were killed while conducting counter-threat operations outside of Bagram Air Base, Afghanistan. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)

Airmen approach the finish line of the 6K memorial run Jan. 8, 2016, at Andersen Air Force Base, Guam. Service members ran six kilometers to represent the six Airmen who were killed Dec. 21, 2015, while conducting counter-threat operations outside of Bagram Air Base, Afghanistan. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)