U.S. Army Col. Sam Whitehurst, right, the commander of the 3rd Brigade Combat Team, 10th Mountain Division, and Lt. Col. Robert Marshal, second from right, the commander of Security Force Advise Assist Team 6, 3rd Brigade Combat Team, walk with their security team to a key leader engagement at Assistance Platform Matun Hill in Khost province, Afghanistan, March 18, 2014. The unit was deployed as a security force advise and assist brigade in support of Operation Enduring Freedom.