Civilians with the National Forest Service and Bureau of Land Management, help unload animals and evacuees off a U.S. Army CH-47 Chinook helicopter assigned to the 2nd General Support Aviation Battalion, 4th Aviation Regiment, 4th Combat Aviation Brigade, 4th Infantry Division, during flood rescue and recovery operations in Boulder, Colo., Sept. 16, 2013. Colorado and Wyoming National Guard units were activated to provide assistance to people affected by massive flooding along Colorado's Front Range. (U.S. Army photo by Sgt. Jonathan C. Thibault/Released)