DS wants to major in Criminal Justice and plans on commissioning into the Army.
If you can only make one trip to UNG, and your son is planning to commission into the Army with a CJ major, here's what I suggest: go to NLC weekend to get more of a life-of-a-cadet experience. But plan your trip so that you get to campus EARLY Friday morning, by 9 am.
Arrange ahead of time with cadet admissions for your son to meet with an academic advisor, a dean, a professor and/or an advanced-level student (junior or senior) in the CJ department. They can set up meetings for him throughout the day -- for example, you and he can do the regular admissions stuff at 9, then meet with a department head at 10, then meet one-on-one with a student at 11, going to a class with him as a guest, and then maybe the cadet, your son, and you can have lunch together and talk some real talk, then in the early afternoon, you would go on the campus tour with your son, then you'd drop him off at NLC weekend.
Since he'll be in the first round of students there, he'll get to go do some cool stuff that the later-arrivals don't get to do, like rappel off the Colombo wall or go on a hike, or go hang out in the dorms, or maybe a game of ultimate frisbee. And since he would already know some of the NLC leaders because of this, the entire weekend will be that much more personal for your son.
I can't guarantee that you'll be able to make all these special arrangements -- it will take some work on your part -- but I fully recommend NLC weekend over the overnight on-campus event since your son plans to commission. Of course, it would be best if you could do both, but if you have to choose one, choose NLC, with some extra stuff added.
Bonus of NLC weekend is that usually the military speciality groups do a demonstration on Friday night. It's intense, and parents are invited to attend. DON'T MISS THIS, if your son ends up going to NLC!
I know several CJ majors and could probably hook your son up with one to talk to over FB if you're interested.