U.S. Army CH-47 Chinook helicopters prepare to land to pick up U.S. troops at an Afghan National Army combat outpost in Afghanistan, June 23, 2015. U.S. Army CH-47 Chinook helicopters prepare to land to pick up U.S. troops at an Afghan National Army combat outpost in Afghanistan, June 23, 2015. SHARE IMAGE: Download Image: Full Size (2.14 MB) Tags: Photo Essays Photo By: VIRIN: 849833-V-IYW15-810.jpg Photo Gallery