United Launch Alliance has begun stacking its first Atlas 5 rocket to fly in service to the International Space Station, a commercial mission to send supplies to the orbiting complex.

A United Launch Alliance Delta 4-Heavy rocket lifted off from Cape Canaveral at 8:09 p.m. EST Thursday (0109 GMT Friday). The long-delayed mission is carrying a classified spy satellite into orbit for the National Reconnaissance Office.

House lawmakers this week proposed to fund NASA’s human-rated lunar lander development program at less than one-fifth of the level the Trump administration wanted, but NASA Administrator Jim Bridenstine said Wednesday the House budget bill is just the “opening salvo” in an appropriations process that now goes to the Senate.