The 22-year-old from Pennsylvania was returning to his forward operating base after a routine patrol when shrapnel from the explosive device ripped into his Humvee.

NPR: Remembering Army Pfc. Kenneth Zeigler

The expectation is that it would have an ultra-low operating cost, achieved through routine operation.

BBC: Skylon: Ending 40 years of hurt

Subways were operating normally Friday morning, with routine delays not linked to the approaching storm.

WSJ: Officials Urge Caution as Snow Starts Falling

The rear train was operating on "automatic" mode, which is routine during rush hour, and preliminary evidence shows that the driver may have employed the brakes, Hersman said.

CNN: Investigator: D.C. Metro crash 'a scene of real devastation'