HEARTBEAT U.S. Navy Seaman Zane Hratgraves shows Sheine Bandosano, a 6th grade Marcos Elementary School student how a stethoscope works by letting her listen to her heart beat, Clark Air Base, Republic of the Philippines, Oct. 20, 2008. The Armed Forces of the Philippines and U.S. Marines and U.S. Navy sailors visited the elementary school to share quality time with the students and donate school supplies and sports equipment. Hratgraves is a corpsman assigned to the Marine Aerial Refueler Transport Squad SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 102406-H-AXQ60-397.jpg Photo Gallery