Barack Obama shakes the prosthetic hand of Army Sgt. 1st Class Leroy Arthur Petry, who lost his hand in Afghanistan when he tossed aside a live grenade and saved the lives of his fellow Army Rangers.

Barack Obama shakes the prosthetic hand of Army Sgt. 1st Class Leroy Arthur Petry, who lost his hand in Afghanistan when he tossed aside a live grenade and saved the lives of his fellow Army Rangers.