Space industrialization will produce new and less expensive space transportation systems.Space industrialization will produce radically new materials that will have military implications in terms of increased strength, decreased weight, and various other physical properties.
Among science fiction stories with space flight, the overwhelming majority are about combat, both between spacecraft and between futuristic ground troops.
Not to mention the occasional starship marine assault trying to board a hostile ship while in flight.
But they are effective only when the majority of people involved agree to abide by them, and when means exist to enforce compliance with them.
These means of enforcement include the military police organizations.
Its formation exactly parallels "Marine" (also French-derived, as are nearly all basic military terms), and it also parallels the English word "spacer," but with a nice shade of meaning — a spacer is anyone who lives/works in space; an espatier is a space soldier. Since the release of Macross, the term has been used in other works: Martian Successor Nadesico, Voices of a Distant Star, and Mobile Suit Gundam.
While the suggested "Ess pa tee yea" isn't especially unlikely, the French would be much closer to "Ess pa cee yay", as the t in the French "spatial" is pronounced like an s or a soft c. Alas, "Spacy" is a little too similar to "Spacey", which in the slang of the United States means was sufficiently massive to go out in a blast of yonder size and shape.
Some may grow large enough to absorb other branches of the military, others may be reabsorbed into other branches.
In William Keith's Galactic Marines series one of the themes of the early novels is how the US Marines fight being absorbed or eliminated.
Where there exist arenas of human activity and inter-relationships and property, there will be disagreements and conﬂict.
We cannot expect these aspects of human nature to change in the next ﬁfty years.
Specifically for the topic of astromilitiares, you should look over Mr.