Technically, "Starfleet Marines" are "non-canon", meanly they don't really "exist" in the "official" Star Trek universe. They don't fit into Roddenberry's idea of peacefully exploring the galaxy and the term "Marine" is a term used for United States armed forces... and since no other country has "marines", it would safe to say that the 23rd or 24th centuries would not have them either. Yes, it's true that soldiers of some sort fought in Deep Space 9's Dominion War, but I doubt they were "marines". If anything, they would be called a new term for "soldiers fighting in space" or "soldiers fighting on other planets". And the picture is too dark to tell if she's on a bridge or in a lab or where. Most Starfleet ships and starbases are brightly lit. Other than that, it's a good picture. She's a hottie and the display panel is cool.