All it took was the gunshot fired outside his Walker County home to trigger training ingrained in former Navy SEAL Marcus Luttrell, the lone survivor of a dramatic battle in Afghanistan in 2005.
He did a sweep through the house. Checked on his mother. And bolted out the door, where he found dead his beloved Labrador retriever, Dasy, a dog given to him to help him recover from his own wounds and the loss of his fellow Navy comrades.
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