Every little bit helps.Finally, it is worth noting that a computer display seen on the bridge of the Dauntless from Prodigy as seen in this post does include a listing for "Marine Corps" though we never saw any Marines in Prodigy. Still, this is the closest "Starfleet Marines" have ever been to being canon in the entire history of the franchise.

I admit I'm a tad curious as to why so many fans seem so hell-bent against there being Starfleet Marines - you can almost see the mouth froth spewing out of the screen - but, hey, it's still fun to talk about.

				


 And I believe the guys in the dark blue turtlenecks in ST V (who accompany Kirk and crew in the raid on Nimbus III) were also intended to be Marines. But you can take from that what you will.