Third tranche Block 2/3 contract

The 'Third tranche Block 2/3 contract' refers to the Space Development Agency's (SDA) Tranche 3 Tracking Layer (TRKT3) contracts under the Proliferated Warfighter Space Architecture (PWSA), awarded in December 2025 to four vendors (Lockheed Martin $1.1B, L3Harris $843M, Northrop Grumman ~$784M, Rocket Lab $805M) totaling $3.5B for building 72 satellites (18 per vendor) to provide near-continuous global missile warning, tracking, and fire-control capabilities for missile defense against advanced threats like hypersonics, with launches planned for FY2029.

Notes

For seven aircraft spanning Block 2 and Block 3 standards.