SPIN BOLDAK, Afghanistan - A steady stream of vehicles and pedestrians move through the Gate of Friendship at the Afghanistan-Pakistan border, April 4, 2011. The gate was constructed to formalize the once informal border between the two countries. (A...

SPIN BOLDAK, Afghanistan - An aerial view of the Registan Desert, Afghanistan, taken from a Blackhawk helicopter, flying over the city of Spin Boldak April 4, 2011. High levels of clay give the desert its red tint. (Army Photo by Spc. Jonathan W. Tho...

SPIN BOLDAK, Afghanistan - An aerial view of the Registan Desert, Afghanistan, taken from a Blackhawk helicopter, flying over the city of Spin Boldak April 4, 2011. High levels of clay give the desert its red tint. (Army Photo by Spc. Jonathan W. Tho...

SPIN BOLDAK, Afghanistan - An aerial view of Spin Boldak, Afghanistan, taken from a Blackhawk helicopter, April 4, 2011. Spin Boldak sits near the Afghanistan-Pakistan border in southern Kandahar province. (Army Photo by Spc. Jonathan W. Thomas, 16th...

SPIN BOLDAK, Afghanistan - Afghan Border Police provide security along the Afghanistan-Pakistan border, April 4, 2011. ABP regularly survey the border, also called the Duran Line, to prevent drugs and explosives from entering the country. (Army Photo...

SPIN BOLDAK, Afghanistan - An aerial view of a Pakistan border security facility taken from a Blackhawk helicopter, April 4, 2011, near the Afghanistan-Pakistan border. Strongholds like this are located up and down the Afghanistan-Pakistan border, al...

SPIN BOLDAK, Afghanistan - An aerial view of an Afghan Border Police facility taken from a Blackhawk helicopter, April 4, 2011, near the Afghanistan-Pakistan border. Strongholds like this are located up and down the border, also called the Duran Line...

SPIN BOLDAK, Afghanistan - An aerial view of an Afghan Border Police facility taken from a Blackhawk helicopter, April 4, 2011, near the Afghanistan-Pakistan border. Strongholds like this are located up and down the border, also called the Duran Line...

SPIN BOLDAK, Afghanistan - An aerial view of a valley along the Afghanistan-Pakistan border, April 4, 2011. Afghan Border Police regularly conduct patrols in areas like this, to prevent smugglers from sneaking drugs and explosives into the country. (...