Re: Starfleet Marine Corps
Starfleet does have some form of ground troops. We've seen them several times, most notably on DS9.
What they are actually CALLED, on the other hand, is not clear. Could be anything. It hasn't been nailed down yet.
"But here you are, in the ninth
Two men out and three men on
Nowhere to look but inside
Where we all respond to PRESSURE!" - Billy Joel