David Easterling, manager of the Suicide Prevention Program at Fort Riley in Kansas spray-paints Army boots white in 2009 as part of an on-base display to commemorate the six Fort Riley soldiers who committed suicide in 2008. Chris Hondros/Getty Images hide caption

itoggle caption Chris Hondros/Getty Images

These gas masks were reconditioned at the Edgewood Arsenal for civilian defense use during World War II. Later, in the 1950s and '60s, the arsenal near the Chesapeake Bay was used for secret chemical weapons testing run by the U.S. Army. Jack Delano/Library of Congress hide caption

itoggle caption Jack Delano/Library of Congress

Maralynn Bernstein (bottom left), the veterans services coordinator for the University of Arizona, confers with Cody Nicholls, director of the Veterans Education and Transition Services Center, at the school's Veterans Center in Tucson. Larry Abramson/NPR hide caption

itoggle caption Larry Abramson/NPR

Nick Staback, who lost both of his legs to a bomb in Afghanistan, talks with his mother, Maria Staback, in Scranton, Pa. Maria Staback took a leave of absence from her job to move in with her son while he was recuperating at Walter Reed National Military Medical Center outside Washington, D.C. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

A scene from the early days of the fighting in Iraq in the spring of 2003. In one incident, three members of an Iraqi family were killed. A U.S. Marine involved in the shooting recently tracked down the family to ask for forgiveness. Laurent Rebours/AP hide caption

itoggle caption Laurent Rebours/AP