epa02158711 US President Barack Obama (L) and Attorney General Eric Holder (R) bow their heads during the invocation at the 29th Annual Peace Officers’ Memorial held on the grounds of the U.S. Capitol in Washington, DC, USA, 15 May 2010. The event, organized by the Grand Lodge Fraternal Order of Police, honors those that have died in the line of duty during the past year. EPA/MARTI H. SIMON / POOL Original Filename: 02158711.jpg