A medic pours water on U.S. Marines from the 2nd Marine Expeditionary Brigade, 1st Battalion 5th Marines who were suffering from heat exhaustion as they walked with heavy packs for miles in the Nawa district in Afghanistan's Helmand province Saturday, July 4, 2009. Both men recovered and were able to continue on with their fellow Marines. Taliban militants attacked a U.S. coalition base in eastern Afghanistan on Saturday with an explosives-laden truck that blew up outside the gates, sparking a two-hour gunbattle and killing two American troops, officials said. (AP Photo/David Guttenfelder)