Bikers join annual Rolling Thunder ride in Washington D.C. (8 images)

Retired Marine Corps First Sgt. Randall Shuck of Findley, Ohio, in full dress uniform awaits the start of the annual Rolling Thunder ride, as bikers prepare to depart from the Pentagon, in Arlington, Virginia, May 24, 2015. Thousands ride from the Pentagon to the Vietnam Memorial in Washington, DC to publicize the POW-MIA issue and to honor America's military veterans during Memorial Day weekend. Photo by Mike Theiler/UPI

Thousands of bikers jam the parking lot of the Pentagon for the annual Rolling Thunder ride, as they prepare to depart from the Pentagon, in Arlington, Virginia, May 24, 2015. Thousands ride from the Pentagon to the Vietnam Memorial in Washington, DC to publicize the POW-MIA issue and to honor America's military veterans during Memorial Day weekend. Photo by Mike Theiler/UPI

U.S. Navy veteran John Swindell of Grand Saline, Texas awaits the start of the annual Rolling Thunder ride, as bikers prepare to depart from the Pentagon, in Arlington, Virginia, May 24, 2015. Thousands ride from the Pentagon to the Vietnam Memorial in Washington, DC to publicize the POW-MIA issue and to honor America's military veterans during Memorial Day weekend. Photo by Mike Theiler/UPI

Pentagon police provide security at the start of the annual Rolling Thunder ride, as bikers prepare to depart from the Pentagon, in Arlington, Virginia, May 24, 2015. Thousands ride from the Pentagon to the Vietnam Memorial in Washington, DC to publicize the POW-MIA issue and to honor America's military veterans during Memorial Day weekend. Photo by Mike Theiler/UPI