I went to a Military Boarding School, met a lot of military people there, spent some time with some regulars doing army shit, pretty fun, what I learned from what life's like in the military, as that's what my school is designed to train people for, is that it's very relaxed and it's more about friendship then anything else. If you want a realistic portrayal of squaddies watch bluestone 42, it's a comedy about a bomb disposal unit in afghanistan written by two people who were in a bomb disposal unit in Afghanistan, and several stories from the show are actually real.
Not sure if foreign armies are different but in the BA Captians are referred to as Boss, not Sir/Ma'am, there's a sense of equalness between ranks when not on duty unless the difference is to significant not to take into account, and there is a respect for CO's above Lt. Bear in mind I've only spent time doing army stuff alongside regulars, I have not been a regular myself.