Adapted from a true story, the film is set against the backdrop of the Iraq War and tells the story of Marine Corporal Megan Levy and her military dog Rex, who saved many lives together. After experiencing life and death and mutual redemption, a person and a dog develop a deep bond. It sublimates the emotions between humans and dogs in a special way against a real background. Dogs are no longer pets, but get along with humans as comrades-in-arms; they no longer live under the protection of humans, but in turn, use their bodies to protect humans. The film restores the Iraq War from the novel perspective of "military dogs", and for the first time fully displays the thrilling scenes of military dogs defusing bombs and saving people in the war zone, and truly depicts the tense and brave state of female soldier Megan Levy and military dog Rex on the battlefield.