Two 3rd Cavalry Regiment soldiers providing security for the Train, Advise, Assist Command – East expeditionary advisory package to Forward Operating Base Thunder prepare to board a CH-47 Chinook helicopter at the conclusion of the advising trip Dec. 10, 2014. The soldiers conducted security at a “cold base” or base unoccupied by U.S. coalition forces Dec. 8-10, 2014, so advisers could safely discuss issues with their Afghan counterparts. (U.S. Army photo by Maj. Vance Trenkel) (Released)