U.S. SENATOR BILL NELSON AT FRICTION STIR WELD LAB

U.S. SENATOR BILL NELSON OF FLORIDA, RIGHT, LISTENS AS ANDY SCHORR, ASSISTANT MANAGER FOR SPACECRAFT/PAYLOAD INTEGRATION AND EVOLUTION, EXPLAINS THE PROGRESS OF NASA'S SPACE LAUNCH SYSTEM DURING A VISIT TO NASA'S MARSHALL SPACE FLIGHT CENTER ON FEB. 12, 2016