Launch vehicle swap with SDA Tranche 1 Tracking Layer D.

Adding launch

After Vulcan slips, Space Force ends up awarding more missions to SpaceX

Space Force awards $2.5 billion in rocket contracts to SpaceX and ULA for 21 launches

Space Force assigns 21 national security missions to ULA and SpaceX

Tranche 1 Tracking Layer E is one of five missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Space Architecture (PWSA) Tranche 1 Tracking Layer constellation, which will provide global indications, warning, tracking, and targeting of advanced missile threats, including hypersonic missile systems.

Vulcan | SDA Tranche 1 Tracking Layer E