A Marine Staff Sergeant pays tribute during Rolling Thunder 2010. Over 300,000 Veterans on motorcycles from across the USA paraded in D.C. the Sunday before Memorial Day, while a solitary, saluting Marine greeted them out on Constitution Avenue. The Marine stood at salute for 3 straight hours, while the parade of roaring bikes kept on coming. Rolling Thunder is held in remembrance of MIA’s, POW’s and those who’ve fallen in the military. Semper Fi.