I would document everything that has been going on. Have you allready signed enlistment papers?
I used to work as a recruiter at a large Information Tech. company. A few of my co-workers were retired military recruiters. Some were very nice, others a bit high strung like your recruiter, all said when it comes down to it they can use some pretty sneaky tactics to get you to enlist. From being nice, to being a salesmen, to lying about what is offered and even being abusive to scare people into enlisting. It takes all kinds, this person may not be in their right mind, please be careful.
I have nothing against the military and have a few ex-military and current military family members but you must be absolutely careful when considering enlisting. Take someone else with you when you talk to the recruiter and spend a good amount of time thinking about enlisting before you actually sign up and really think about your self motivations for enlisting.
Listen to your gut, if it's telling you that something isn't right about this recruiter and enlisting, don't do it. You have a good back up plan of LVN school.
My cousin is a senior in high school this year, as is his girlfriend. Turns out she wants to be a Pediatrics Nurse, out of the blue (she had never before contimplated going military) and without discussing it with anyone (including her parents) she enlists with the army because they told her they will give her all the nursing and Peds. experience she desires. I'm not so sure about that. I know a few army nurses and they didn't immediately go into nursing education. It took them a few years of being placed where ever the army needed them before they had the chance to take their nursing classes and there wasn't a whole lot of Peds. experience in there at all.
Now, if she had talked to a few nurses (there are 2 and me a student nurse in my family) she would have found out that there are numerous nursing schools here in Pittsburgh offering programs from 2 years to 4 years, Master's programs, CC that only costs a few thousand dollars total to private schools costing tens of thousands. Plus, she could try to intern and would more than likely have done her Peds. rotation at Children's Hospital.
I guess what I'm getting at is there are a ton of options to get a nursing education, no matter what you are looking for ie. LVN, RN, BSN, Master's, etc. and you don't have to take the first offer you get. Remember, to the recruiter you are a quota, a paycheck. Think of it like buying a new car. Does that car salesmen have your best interest at heart? Does he really want to make sure that you get the best deal at the lowest price and get a car with everything you need and all the gadgets you don't? No, his job is to the sell the car at the highest price possible even if that means fibbing about what it comes with and that the sports car is the best car for what you need when you really only need a compact.