Millennium Space Systems reports it has completed a program design review (PDR) for a U.S. Space Force missile tracking satellite in just four months, the company announced Wednesday. The satellite is for Space Systems Command’s Missile Track Custody (MTC) program.

The MTC program is pursuing small satellites in Medium-Earth Orbit (MEO) for missile warning. Millennium Space Systems first received a SSC award for the program last year.

The manufacturer based the spacecraft off its flight-proven Altair-spacecraft. Millennium Space Systems is on contract for MTC space vehicle one, with options for two additional satellites. The company expects those options to be exercised, in addition to a contract for space vehicles four through six in the fourth quarter of this year.

“We’re clearly demonstrating we can design, build and test systems in shorter time frames on schedule,” said Jason Kim, chief executive officer, Millennium Space Systems. “In the PDR, our team demonstrated sound technological understanding of mission needs and requirements, including the space and ground segments and how launch plays into those.”