Rev. Gary Hall, Dean of the Washington National Cathedral, blesses riders and their motorcycles who will participate in Rolling Thunder during the Blessing of the Bikes at the Washington National Cathedral in Washington, DC, May 22, 2015. Clergy from around the region blessed the motorcycles and their riders prior to Monday's Rolling Thunder event, where thousands of motorcycles drive around the National Mall to honor prisoners of war (POWs) and missing in action (MIA) military members. AFP PHOTO/ SAUL LOEB        (Photo credit should read SAUL LOEB/AFP via Getty Images)