Lucca, a Marine dog who lost her leg in Afghanistan, receives the Dickin Medal

From the moment he saw Lucca, Chris Willingham knew she was special.

The two met in 2006 in San Antonio. Willingham was a Marine specializing in the training of military dogs, and Lucca was a 2-year-old German shepherd and Belgian Malinois mix being taught to sniff out bombs. They came together...