Rolling Thunder participant Gerald McCullar portrays a prisoner of war in a Vietnam War-era "Tiger Cage" at the 2011 Rolling Thunder Memorial Day weekend ceremony on the National Mall, May 29, 2011. Defense Secretary Robert M. Gates and Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, spoke at the annual event that draws thousands of motorcyclists to the capitol in an effort to raise awareness for troop and veteran issues. Rolling Thunder participant Gerald McCullar portrays a prisoner of war in a Vietnam War-era "Tiger Cage" at the 2011 Rolling Thunder Memorial Day weekend ceremony on the National Mall, May 29, 2011. Defense Secretary Robert M. Gates and Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, spoke at the annual event that draws thousands of motorcyclists to the capitol in an effort to raise awareness for troop and veteran issues. SHARE: Download: Full Size (0.31 MB) Tags: Photo Essays Credit: VIRIN: 148141-J-NZW67-729.jpg Photo Gallery