National Peace Officers Memorial Service in Washington (14 images)

US President Barack Obama (L) places a flower on a wreath during the National Peace Officers Memorial Service, an annual ceremony honoring law enforcement who were killed in the line of duty, on Capitol Hill in Washington DC, on May 15, 2012. Also in the picture is an honor guard, a member of the Capitol Police. UPI/Michael Reynolds/Pool

US President Barack Obama (R) picks up a child while greeting family members of fallen law enforcement officers, at the National Peace Officers Memorial Service, on Capitol Hill in Washington DC on May 15, 2012. The annual ceremony honors law enforcement who were killed in the line of duty. UPI/Michael Reynolds/Pool

US President Barack Obama (back R) delivers remarks at the National Peace Officers Memorial Service, an annual ceremony honoring law enforcement who were killed in the line of duty, on Capitol Hill in Washington DC, on May 15, 2012. Also in the picture is an honor guard, a member of the Capitol Police. UPI/Michael Reynolds/Pool

Director of the US Secret Service Mark Sullivan, attends the National Peace Officers Memorial Service, an annual ceremony honoring law enforcement who were killed in the line of duty, on Capitol Hill in Washington DC on May 15, 2012. UPI/Michael Reynolds/Pool