Trucks carrying concrete barriers sit waiting for nightfall, Feb. 25 at Contingency Operating Base Marez, Iraq. Each night, Soldiers with the 733rd Transportation Company, 395th Combat Sustainment Support Battalion, 15th Sustainment Brigade, 13th Sustainment Command (Expeditionary) deliver the barriers to checkpoints in and around Mosul as part of the Disputed Internal Border Sites mission, which aims to provide extra security at what is traditionally the religious and cultural border between Iraq and Kurdistan.