Sengoku Jieitai 1549(戦国自衛隊1549Sengoku Jieitai 1549) or Samurai Commando Mission 1549 is a feature-length film and manga series focusing on the adventures of a modern day Japan Ground Self-Defense Force (JGSDF) element that accidentally travels to the Warring States period of Japanese history. Both the film and manga are based on Sengoku Jieitai (aka "Time-Slip", "GI Samurai", 1979), an action film which starred Sonny Chiba as the leader of a JGSDF platoon sent back to feudal Japan.