Barack Obama visits Fort Hood

Barack and Michelle Obama walk to Marine One on the south lawn of the White House in Washington Photograph: Jason Reed/Reuters

Barack and Michelle Obama cross the south lawn of the White House Photograph: Gerald Herbert/AP

Marine One lifts off from the south lawn Photograph: Jason Reed/Reuters

Colonel Steven Shepro, commander of the 316th Wing, escorts Barack and Michelle Obama to Air Force One at Andrews air force base in Maryland Photograph: Pablo Martinez Monsivais/AP

Soldiers wait for the start of the memorial service for the 13 victims of the Fort Hood shooting rampage Photograph: Joe Raedle/Getty Images

Soldiers stand to attention as the flag is raised to half-staff before President Obama's visit Photograph: Paul Sakuma/AP

The rifles, boots and helmets of the soliders killed in the attack line the podium before the start of the memorial service Photograph: Tannen Maury/EPA

A soldier sleeps while waiting for the memorial service Photograph: Larry W Smith/EPA

A woman waits with soldiers for the memorial service Photograph: Larry W Smith/EPA

Barack and Michelle Obama arrive in Killeen, Texas Photograph: Kevin Lamarque/Reuters

Barack Obama sits with his wife during the memorial service Photograph: Tannen Maury/EPA

Barack Obama speaks at the memorial service Photograph: Pablo Martinez Monsivais/AP

Soldiers salute during the playing of taps at the memorial service Photograph: Joe Raedle/Getty Images

Barack and Michelle Obama pause in front of the picture of Sergeant Amy Krueger as they pay their respects to the fallen soldiers Photograph: Rodolfo Gonzalez/AP

The presidential coin that Barack Obama placed among other momentos Photograph: Joe Raedle/Getty Images

Soldiers prepare to leave after the memorial service Photograph: Joe Raedle/Getty Images