A bead of sweat rolls off the rim of the hat of U.S. Marine Cpl. William Woods of Glen Allen, Va. as he awaits instuction from the leader of the Quantico Marine Corps Band at Manassas Battlefield Park, Thursday, July 21, 2011. The band performed in extreme heat during the 150th Anniversary First Battle of Manassas commemorative program. (AP Photo/Richmond Times-Dispatch, P. Kevin Morley) MANDATORY CREDIT

Associated Press
A bead of sweat rolls off the rim of the hat of U.S. Marine Cpl. William Woods of Glen Allen, Va.  as he awaits instuction from the leader of the Quantico Marine Corps Band at Manassas Battlefield Park, Thursday, July 21, 2011.  The band performed in extreme heat during the 150th Anniversary First Battle of Manassas commemorative program. (AP Photo/Richmond Times-Dispatch, P. Kevin Morley)  MANDATORY CREDIT
A bead of sweat rolls off the rim of the hat of U.S. Marine Cpl. William Woods of Glen Allen, Va. as he awaits instuction from the leader of the Quantico Marine Corps Band at Manassas Battlefield Park, Thursday, July 21, 2011. The band performed in extreme heat during the 150th Anniversary First Battle of Manassas commemorative program. (AP Photo/Richmond Times-Dispatch, P. Kevin Morley) MANDATORY CREDIT
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