Military Why Navy Yard shooting raises tough questions for Pentagon (+video)

The Navy Yard shooting has raised questions about security clearance and mental health, but with many vets dealing with combat-related stress, any solutions are fraught with complications.

By , Staff writer

Charles Dharapak/AP

In the wake of the mass shooting this week that killed 12 people at the Washington Navy Yard, senior Pentagon officials have vowed to review the process for granting security clearances.