Operation Just Cause: In the early morning hours of 20 December 1989, the entire 75th Ranger Regiment, followed by the reinforced Division Ready Brigade of the 82nd, conducted combat jumps to secure the Rio Hato and Torrijos-Tecumen airports in Panama. This marked the first and only combat parachute deployment of the M551 Sheridan. Fourteen tanks were deployed in total. Four were transported by C-5 Galaxy and ten were dropped by air, though two were destroyed on landing.