Division I believe spend portions of time out in the world on campaigns.
If strictly military isn’t your thing, perhaps enquiring as to being support staff might be of interest? (Everything from cooks, medics and stable hands) this might get you out and about, provide sociable “camp RP” out in the world, without the uniforms / orders etc that come with the military trappings. I hope you find something that suits you!
Edit: There is also a RP discord group on Argent Dawn which may be able to help.
Whilst I’m no longer / very rarely horde these days, I am happy to offer advice, feel free to add me Mattian#2500
Edit2: do check out Guide to roleplay for newcomers a very thorough guide and good grounding if you’ve not seen it already.