Marine Corps

The famous Washington D.C. race is now flatter and faster.

Lance Corporal Kerr's act of kindness has made him an overnight hero.

He initially took up running to lose weight.

Over 30% of runners will be debuting.

The event honors the establishment of the United States Marine Corps.

Runners now have the option to transfer their bib to someone else.

He did it under two hours.

Nearly 8,000 runners will participate in the event.

He's running his first half marathon next Sunday.

He is doing it to celebrate his dramatic weight loss.