I need an acronym for a space military

I'm doing a short story set in the future. The military is an international one and in space that's pretty much it.

Is it like a union of planets that form this military? An empire? A single planet?

It's kinda like we created a single military and went to space with them and colonized planets. So it's human only.

So I'm going to assume Earth exists in this world, and offer this:

E.S.I.M.
Earth and Space Interplanetary Military

Do you want me to add the colonization part?

I.S.A.A.C.C
International Space And Astronomical Comand Center
If you still need one

damn dude that's actually heaps fuckin good. I went on reddit and got nothin so thx heaps.

Your welcome