York confirms successful deployment and health of 21 satellites for SDA Tranche 1 missionby Clarence OxfordLos Angeles CA (SPX) Sep 17, 2025York Space Systems has confirmed first contact and the healthy status of all 21 satellites launched September 10 from Vandenberg Space Force Base for the Space Development Agency's (SDA) Tranche 1 Transport Layer mission, part of the Proliferated Warfighter Space Architecture. The satellites were deployed and checked within hours, a milestone that underscores York's high-rate production and operational efficiency. "Confirming health so quickly across 21 satellites is proof that York's high-rate production paired with disciplined mission operations delivers results. York is the first prime contractor for the Tranche 1 Transport Layer to launch and deploy satellites, with another 21 scheduled for deployment later this year. The company's rapid first-contact capability was strengthened by ATLAS Space Operations' software-led ground architecture, acquired by York earlier this year.