CHECKPOINT CHAT U.S. soldiers with meet with Afghan border police at Checkpoint 4 in Spin Boldak, Afghanistan, Jan. 9, 2010. The mission of the border police is to secure the borders of Afghanistan and prevent the illegal entry of people and contraband. The U.S. soldiers are assigned to the 8th Squadron, 1st Cavalry Regiment. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 240286-E-IFQ43-452.jpg Photo Gallery