A standing-room-only crowd watched, teary-eyed but smiling, as a Florida Army National Guardsman was ceremoniously retired from military service at Walter Reed Army Medical Center here Feb. 21. Soldiers, civilians and children filled the conference room for the occasion. Staff Sgt. Dustin Tuller sat at attention in a wheelchair, his Class A uniform trousers neatly folded beneath his left hip and right thigh, as his battalion commander read the official orders retiring him from the Army. The 28-year-old college student, father of four and infantryman, had both legs amputated after being wounded in an attack in Iraq in December. Army...