Army Staff Sgt. Darrell Griffin Jr. was killed in March 2007 in Iraq by a sniper. Courtesy of Darrell Griffin Sr. hide caption

itoggle caption Courtesy of Darrell Griffin Sr.

1st Lt. Fred Simpson considers a computerized mental exercise designed to improve focus and memory. Simpson was knocked unconscious by a grenade blast in Afghanistan and now receives treatment at Walter Reed Army Medical Center in Washington. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Soldiers with traumatic brain injury clear improvised explosives on a mock mission while taking fire from pretend insurgents armed with paintball guns. Blake Farmer/Nashville Public Radio hide caption

itoggle caption Blake Farmer/Nashville Public Radio

In the late 1990s, both Marinovich and Silva traveled to the Middle East to photograph the ongoing clashes in the region. Silva captured this image of a young Palestinian boy throwing a tire in the West Bank town of A-Ram in March 1997. Joao Silva/AP hide caption

itoggle caption Joao Silva/AP