Unfortunately, they do.
It's called the Office of the Attorney General. They're literally both part of the same "department" and enforce federal not local law unless there are specific arrangements made with the local authorities (which did happen historically in the case of the latter, but has been largely obselete for over a century now).
I learned something today.
I'm actually ok with reverse course on Starfleet Security. I think my holdup was the idea that Starfleet Security tends to portrayed as a somewhat shadowy, intelligence-type organization... but given how massive Starfleet departments are, i'm fine with that being just one aspect of it.
It still makes sense for the ships tactical officers to be Security, as it seems now "Starfleet Security" is essentially the all-encompassing "military arm" of Starfleet.
But he apparently agreed to be Second Officer, which argues for the idea that he's content to be both. Potentially more so than LaForge, who is no better than fourth or fifth in command.
I think alot of it comes down to attitude rather than actual position. Yes, Scotty agreed to be second officer, and a stone cold bad ass when he was in command.
However despite have training, credential and experience for it... I find it likely for Scotty to not really identify in that role. But regardless of how Scotty might feel, I still think it's entirely plausible for someone like Pulaski to have the training and credentials to do so, while also just... opting not to. She's a doctor. She doesn't care about Starfleet stuff. She cares about medical stuff.
I'm also fine with things being a touch more flexible... it's brought up in regards to Troi that to get the promotion to Commander, she needs to take the bridge officer test. I don't think it's a stretch to think that Starfleet Medical may have some different requirements for promotion, going for the bridge officer test may one route, but there may also be a more medical-centric option as well. It's probably not particularly necessary for medical professionals to train in starship command.
Troi may have also potentially had other options, but the only one that really feasible in her current position/role was the bridge officer test.
As I said, The Loss (TNG) pretty much hangs on the idea that Troi is the only official counsellor on board, which implies that Troi is part of the Medical Department and subordinate to Crusher/Pulaski in a similar way that LaForge and Yar/Worf are subordinate to Data as the Senior Officer within the Operations Department.
I can give you Troi on that, although i'm not 100% sure she's considered Medical. She probably should be, but they might lump a therapist under general science. She doesn't actually appear to be a psychiatrist, she never attempts to treat a condition with medication. She's a counsellor, and actually I COULD be wrong on this, but I believe DS9 established Ezri as being under science.
I still don't believe that Yar/Worf were subordinate to Data. Operations and Security have always been portrayed as different departments. There has never been any indication of Worf reporting to Data, aside from Data's role as Second Officer. Security/Tactical is a fairly well defined department of it's own... oddly enough, "Operations" tends to be the less defined one.
Troi is certainly the liasion between the command staff and the civilian passengers, but there's no indication that she has any formal management authority over them, indeed I would expect only the Commanding Officer or current Officer-in-Command would.
Possibly, although Troi might be a somewhat special case with authority granted on ship... Picard never came off as the type who want to bothered with all of that, especially given his general aversion to children. I can see that not being official Starfleet policy, but more a Captain Picard policy.
From a factual standpoint, he's entirely incorrect.
I'd say perhaps more from a legal standpoint, he's incorrect. It's been ingrained fairly well that by and large, Starfleet itself considers military operations to be a secondary focus. So yes, while... they are a military because they do military things as a secondary mission, their primary mission is non-military... somebody with the attitude that "Starfleet isn't the military" may not be 100% factually correct, but it does convey how Starfleet operates. When you have high ranking officers in your military saying your military isn't a military... maybe the 100% factual statement isn't really as relevant?
I want to circle back to an earlier thing about the general nomenclature. I don't want to use "MACO" or "Commando" partly because those things do exist and I believe they continue to exist. We know member worlds still have forces of their own... Earth probably still has MACO's, Vulcan still has Commandos. Using "Marine" for these forces is a nod to both (my) established history, a still generally applicable term, and also a nod to the decades of fandom/beta canon around Marines.
On that note as well, I was thinking a bit more about the Marine timeline... here's my broad strokes of what i've come up with...
22nd century Earth Starfleet... there are no Marines, MACO's serve on ships by 2153. By the time of the Romulan War, MACO's are a more common sight, although we know there is little in the way of ground warfare.
When the Federation forms and Starfleet shifts to Federation command (and I think that is the case... in my conjecture, Earth spearheads the Federation by offering up a huge chunk of Starfleet to directly transfer to Federation command), there aren't Marines right out of the gate. They come in shortly after, initially a small force that was somewhat haphazardly created from whatever forces member worlds offered up, a majority were MACO's given Earth's general tendency to go all-in on the Federation.
They decide on "Starfleet Marine Corps" for the name of this organization and are generally organized in a fashion most similar to the MACO's, since they formed the backbone of the force anyway. Some early conflicts allow the Marines to prove their worth to a Federation who has been generally unsure of how much military authority it should have.
Through the late 22nd century into the early 23rd, the Marine Corps grows into a much larger force, to the point that in in the very early 23rd century, the Marine Corps becomes it's own department under Starfleet Command (previously being under Starfleet Security).
And then the Khitomer Accords occur, placing some hard limits on what forces the "Big Three" governments can field. It's clear to most in the Marines that they're organization is going to be the most directly threatened, and they're right. Right around 2300, the Marine Corps is dissolved as a department of it's own. However, much of the personnel are transferred into Starfleet Security, with the intent of still maintaining a combat-ready force, skirting the lines of what the Accords allow.
Reorganized under Starfleet Security Advanced Tactical Operations, the Marines would get a new life. This new force would be much smaller in scope than the former Marine Corps, essentially a large special forces group trained to be combat specialists. The traditions of the Marine Corps lived on at least in some form, and despite an official designation as Advanced Tactical Security Officers, they were still referred to as Marines both internally and throughout the fleet.
EDIT -
Downtime at work today i'm messing with my trying to create a Starfleet org chart type thing. I forgot that "Starfleet Tactical Command" exists, also either referred to as, or a sub-department, "Tactical Operations".
I might almost be overthinking the name for this. Tactical Unit is a term that has showed up, and sounds like something that would be in Star Trek. I kind of like that. We have an organization made up of Tactical Unit "Marines".
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