This year’s American Humane top military working dog sniffed out bombs and explosives over three combat tours with the Marine Corps across Iraq and Afghanistan and is now competing for the grand prize title of American Hero Dog.

Sgt. Yeager, a Marine Corps improvised explosive detection dog, carried out nearly 100 combat patrols and was awarded the Purple Heart after an IED explosion in Helmand province, Afghanistan, in April 2012, took out part of his ear, according to a press release.

His handler, Marine Lance Cpl. Abraham Tarwoe, was killed in that explosion during a dismounted patrol in Helmand province’s Marjah district.

The pair, whose bond was described as “unbreakable,” according to American Humane, were both assigned to 2nd Battalion, 9th Marine Regiment.