Sgt. Derrick Junge was diagnosed with a concussion, but passed over for a Purple Heart. Junge has not received rehabilitation or treatment for ongoing medical difficulties, and he struggles with simple tasks. NPR/Frontline hide caption

itoggle caption NPR/Frontline

Don L. Blankenship, chairman and chief executive officer of Massey Energy Company (left), watches as protesters disrupt a luncheon at the National Press Club, where he spoke on Thursday. Wayne Huang/NPR hide caption

itoggle caption Wayne Huang/NPR

Mine ventilation issues are critical to running a safe coal mine. Here, a rescuer walks through a blocked tunnel in the Crandall Canyon Mine, northwest of Huntington, Utah, where six coal miners were trapped in 2007. Rick Browmer/AP hide caption

itoggle caption Rick Browmer/AP

Methane monitors are mounted on 30-foot-long continuous miners like this one, and other mining machines, to warn coal miners about dangerous levels of explosive methane gas. File photo hide caption

itoggle caption File photo