Editor's Note: This article by Richard Sisk originally appeared on Military.com, a leading source of news for the military and veteran community.

The bad guys and their improvised explosive devices couldn't hide from Marine Sgt. Yeager, a Purple Heart veteran of three tours in Afghanistan.

His specialty was route clearance, and he was credited with sniffing out dozens of roadside bombs in more than 100 combat patrols for his Marine buddies.

On April 12, 2012, Yeager and his handler, Lance Cpl. Abraham Tarwoe, were hit by one of those roadside bombs while on patrol in southwestern Helmand province with a unit from the 2nd Battalion, 9th Marine Regiment.

Tarwoe, originally from Liberia, perished in the blast and Yeager was hit with shrapnel and lost part of an ear.

Yeager was one of four working dogs who received American Humane's K-9 Medal of Courage in a ceremony Tuesday at the Rayburn House Office Building.

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