SDA Tranche 1 Tracking Layer D

Fourth of five launches deploying the Space Development Agency's Tranche 1 Tracking Layer, and the second of the campaign's two Vulcan flights. The satellites, built by L3Harris and Northrop Grumman, carry wide field-of-view infrared sensors for persistent warning, tracking, and targeting of advanced missile threats, including hypersonic glide vehicles.

Launch part of the National Security Space Launch Phase 2 contract awarded in 2022.