The predominate canine selected by the US military during the Vietnam War was the German Shepherd Dog, which was used in the roles of Scout Dogs, Sentry Dogs, Mine Detection Dogs, and the US Navy used Water Dogs to detect enemy under water divers in South Vietnam. The Labrador Retriever was the military's choice for their Combat Tracker Teams (CTTs). Combat Tracker Teams consisted of one Labrador and four or five men: the handler, an observer, one or two cover men, and the team leader. Labradors were selected by the military for tracking because of their distinct smelling qualities, and were used to locate wounded US servicemen, enemy patrols, and downed allied airmen in Vietnam. The US Army Labrador Retrievers received their combat training at the British Army's Jungle Warfare School in Malaysia.