U.S. soldiers attach cargo to a CH-47 Chinook helicopter at Roberts International Airport in Monrovia, Liberia, Dec. 12, 2014. U.S. soldiers attach cargo to a CH-47 Chinook helicopter at Roberts International Airport in Monrovia, Liberia, Dec. 12, 2014. SHARE: Download: Full Size (1.01 MB) Tags: photo essays Credit: VIRIN: 828969-J-RVX44-546.jpg Photo Gallery