President Barack Obama places his hand over his heart before laying a wreath at the Tomb of the Unknown Soldier to observe Memorial Day at Arlington National Cemetery in Arlington, Va., May 25, 2015. President Barack Obama places his hand over his heart before laying a wreath at the Tomb of the Unknown Soldier to observe Memorial Day at Arlington National Cemetery in Arlington, Va., May 25, 2015. SHARE: Download: Full Size (2.77 MB) Tags: Photo Essays Credit: VIRIN: 333642-S-CLT64-862.jpg Photo Gallery