Rolling Thunder tribute
Credit: Getty Images
U.S. military veterans Carlos Hollifield (L) of Knoxville, Tennessee, Billy Riley of Union County, New Jersey, and others carry a wreath before placing it at the grave of an unknown Union solider who died during the Civil War during a ceremony at the Congressional Cemetery May 25, 2012 in Washington, DC. The ceremony is part of weekend events marking the 25th anniversary of the Rolling Thunder Ride for Freedom, a motorcycle rally in the nation's capital. Started in 1988 as a protest to bring more awarness to issues about POW/MIA, Rolling Thunder now has 90 chapters across the United States and expects more than 900,000 veterans and their supporters to participate in the ride.