
I feel like I ought to echo the OP in noting that adventurers that are part of a GC are, by default, part of the "adventurers' brigade" of that GC, and the game seems to frame that as basically being a free agent and resource for the GC -- someone who can take on sensitive missions and might be drafted in the event of dire need. If you have a rank, it's largely ceremonial, since you're really outside of the normal command structure. Your superior officer in that group is more like a handler, a contact, and a case officer than your commander. Really, I view it as the same sort of situation as the heroes of Star Wars have with regards to the Rebel Alliance. Sure, Luke has a rank, but he's largely an operative who acts on his own, doing things that need doing. When the Rebels need his assistance, they can reach out to him, but they're not giving orders so much as making requests to someone who typically shares the same goals. On the other hand, it's not like Luke can really give orders and expect them to be followed solely due to his rank (he's a special case since he's also famous and well-regarded).
That said, I agree with the OP 100% that those who RP being regulars of a Grand Company should pay attention to how militaries actually work and make an effort to portray such a character correctly. I personally think this is especially important given the "out" SE has provided for everyone in the "adventurers' brigades;" since you're making an active choice to RP something different and more restrictive, you should, IMO, put in the effort to make it different and more restrictive so that it feels more real. Step up to the challenge of the concept!
That said, I agree with the OP 100% that those who RP being regulars of a Grand Company should pay attention to how militaries actually work and make an effort to portray such a character correctly. I personally think this is especially important given the "out" SE has provided for everyone in the "adventurers' brigades;" since you're making an active choice to RP something different and more restrictive, you should, IMO, put in the effort to make it different and more restrictive so that it feels more real. Step up to the challenge of the concept!

The Freelance Wizard
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((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))
Quality RP at low, low prices!
((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))