In observance of Memorial Day and soldiers still missing in action, thousands of bikers ride near the Lincoln Memorial on Sunday during the annual Rolling Thunder celebration in Washington, D.C. Arty Muller, the group’s national executive director, says motorcyclists, many of them veterans, are uniting to push for full accountability for missing soldiers and prisoners of war and are calling for better health care for recently returned troops. (J. Scott Applewhite/Associated Press)