In modern times, particularly during World War I and World War II, animals played a vital role in active combat, transportation, and communication — not to mention the numerous animal mascots who helped keep morale high in the most testing of times. It’s estimated that in World War I alone, more than 16 million animals served in these various ways. Here are a few such incredible wartime animals, including daring dogs, courageous carrier pigeons, and a mischievous brown bear.