York Space Systems (NYSE: YSS) confirmed the healthy status of all 21 satellites in its second production lot within five hours of launch vehicle separation, according to a company statement.

The satellites launched July 16 from Space Launch Complex 4 East at Vandenberg Space Force Base, California, aboard a dedicated Falcon 9 rocket. The mission supports the Space Development Agency's Proliferated Warfighter Space Architecture Tranche 1 Transport Layer program.

With the deployment, York claims to be the first T1TL contractor to deploy a second orbital plane for the Space Development Agency, bringing its total T1TL satellites on orbit to 42. The company has now placed 55 spacecraft in orbit across eight total launches.

Atlas Space Operations ground stations and York's Freedom Ground Software are supporting the mission and early orbit checkout.

"Rapidly confirming health across 21 satellites in a second consecutive T1TL launch is proof of York's mature high-rate production and disciplined mission operations capabilities at scale," said Melanie Preisser, EVP and GM of York.

The T1TL system is York's third constellation and fifth mission being operated simultaneously from its dedicated Mission Operation Centers. York is based in Denver, Colorado.