Motorcyclists travel on Highway 153 on Sunday, July 19, 2015, in Chattanooga, Tenn., as they ride from the Armed Forces Career Center on Lee Highway to the U.S. Naval and Marine Reserve Center on Amnicola Highway in the aftermath of a Thursday terrorist attack at those two facilities that killed four Marines and one member of the U.S. Navy. Photo by John Rawlston /Times Free Press.
Hundreds of motorcycle officers lead the funeral procession of Jupiter Police Officer Bruce St. Laurent, Friday, September 14, 2012, in Palm Beach Gardens, Florida. Officer St. Laurent, a 20-year veteran police officer, was killed in a crash during a motorcade for President Barack Obama last week.