Definition of "spaceforce"

"Wouldn't fit through the window," Lex apologized. "Anyway, a starship's a big responsibility — you're planning to join the spaceforce, aren't you?"

1978, Jonathan Fast, Mortal Gods

The MSP may eventually become part of a new spaceforce that coordinates the broad range of defensive and offensive space assets. In addition, a new emphasis is being placed upon NASA and the U.S. Air Force to coordinate activity on such a space plane/RLV development.

2003, A Charania, “Operational Capabilities and Legal Implications of a Military Space Plane”, in Proceedings of the Forty-Fifth Colloquium on the Law of Outer Space, volume 45, University of California, School of Law, Part 2002

Now, the Federation needed some sort of body to enforce its regulations, but the alphas were unable to agree on how to organize this, so Earth, who had the largest and most advanced spaceforce, offered to establish the Federal Fleet

2015, Rachel Searles, The Stolen Moon