EMPTY CHAIR A Marine salutes a motorcyclist riding in the 21st Rolling Thunder Ride for Freedom, May 25, 2008, in Washington, D.C., which raises awareness about prisoners of war, troops missing in action and veterans' benefits. Standing before the Marine is a table with an empty chair, which symbolizes the absence of those servicemembers lost in combat. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 773584-K-TPL91-338.jpg Photo Gallery