This bill would require the President to withdraw U.S. military forces from any hostilities in or against Cuba unless Congress has specifically authorized such actions through a declaration of war or other legislation. It applies to all military branches, including the Coast Guard, and would prevent operations like blockades or military action around Cuba unless approved by Congress. The bill aims to ensure that any significant use of military force involving Cuba is first debated and authorized by lawmakers. However, it makes exceptions for self-defense if the U.S. faces an attack or urgent threat, and for ongoing legal counter-narcotics missions.