ADVANCE FOR USE SUNDAY, JAN. 6, 2012 AND THEREAFTER - In this Thursday, Nov. 15, 2012 photo, a U.S. Marine, left, looks down a hole in a tunnel used in the construction of the Kajaki da

 

              ADVANCE FOR USE SUNDAY, JAN. 6, 2012 AND THEREAFTER - In this Thursday, Nov. 15, 2012 photo, a U.S. Marine, left, looks down a hole in a tunnel used in the construction of the Kajaki da
ADVANCE FOR USE SUNDAY, JAN. 6, 2012 AND THEREAFTER - In this Thursday, Nov. 15, 2012 photo, a U.S. Marine, left, looks down a hole in a tunnel used in the construction of the Kajaki dam in Helmand province, south of Kabul, Afghanistan. A $500 million effort to refurbish the massive dam and hydro-electric power system with an extensive network of power lines and transmission substations is supposed to bring electricity to 332,000 people in southern Afghanistan, increase crop yields and build up a cohort of trained Afghan laborers in a region badly in need of them. (AP Photo/Heidi Vogt)