Two spacewalkers attached a new docking port to the International Space Station Friday, clearing the way for U.S. crew ferry ships being built by Boeing and SpaceX to begin test flights to the lab complex next year.

The United Launch Alliance Atlas 5 rocket was transfered from its assembly building to the pad at Cape Canaveral’s Complex 41 today for Thursday’s launch of the U.S. military’s third SBIRS GEO missile warning satellite.

NASA’s Mars 2020 Perseverance mission resumed normal operations Friday after cold temperatures forced the spacecraft into space mode soon after a successful launch from Cape Canaveral.