Her name is Lucca, and she is a 12 year-old German Shepherd who completed over 400 separate missions during six years of active service with the U.S. military. During her service Lucca would sniff out explosives. For the most part she was always successful on her job. They say that she protected the lives of thousands of allied troops during her career.
In this picture you see Lucca when she was injured and lost a leg. She was out sniffing for an explosive, and suddenly she stepped on it. Of course the explosive caused her to lose her left front leg. She also suffered a couple of injuries in her chest. 
Thankfully the burns were not that serious. But Lucca turned out to be a really strong dog because in just 10 days she recovered from the terrible incident in 2012. Ever since she has never patrolled again. 
To receive the PDSA Dickin medal, Lucca had to travel from southern California to London with her former handler and owner Gunnery Sergeant Christopher Willingham.
Lucca is now the first Marine Corps dog to receive the esteemed honor. This is what her former handler had to say about his brave dog: ‘Lucca is very intelligent, loyal and had an amazing drive for work as a search dog.”
“‘In addition to her incredible detection capabilities, Lucca was instrumental in increasing moral for the troops we supported. In between missions, I took the searching harness off and let her play and interact with the troops.”
“Due to her personality, demeanor and proficiency as a search dog, Lucca made friends wherever she went. Today, I do my best to keep her spoiled in her well-deserved retirement.”
Source: Dailymail