Dogs have long been involved in warfare, and their use on the battlefield goes back several thousand years. They were used in various capacities by the Ancient Egyptians, the Ancient Greeks, and the Romans, and they're still used to this day as scouts, trackers, sentries, and mine detection dogs. Approximately 5,000 US military dogs served during the Vietnam War, and dogs have been in combat with US soldiers during every major conflict. In homage to these incredibly animals, Bored Panda has compiled this list of our favorite service dogs in action. Don't forget to vote for the best!