Which Navy legacy system has transitioned to the Space Force?

The correct answer is the UHF SATCOM Satellites. This system is crucial for providing secure communication capabilities for military operations. As the Department of Defense has adapted to new threats and integrated multi-domain operations, the responsibility for satellite communications systems, including the UHF SATCOM, has transitioned to the Space Force. This reflects the ongoing evolution of military organizational structures and the need for a dedicated focus on space as a critical domain for national security.

While the Battle Management System is an important tool for operations, it has not transitioned to the Space Force but remains under the Navy's domain. The Global Positioning System, while crucial for navigation and timing, has not transitioned to the Space Force either; it continues to be managed by the U.S. Air Force. The Strategic Defense Initiative was a Cold War-era program focused on missile defense, and it is not an active system that has transitioned to the Space Force. Each of these alternatives serves key roles in military operations but do not reflect the transition to the Space Force like the UHF SATCOM Satellites do.