Retired U.S. Marine Corps Cpl. William Kyle Carpenter, right, poses for a photo with Mark Ruffalo at the David Letterman studio in New York City, N.Y., June 25, 2014. The visit is part of a media tour after he was awarded the Medal of Honor at the White House on June 19, 2014. (U.S. Marine Corps photo by Cpl. Michael C. Guinto/Released)