@Mike: haha, it probably will.
@Skylar: Thanks for the info! I'll look it up! And wouldn't you need more than twenty years to retire? Or so says my dad, but, he's a pretty simple minded character.
@Sflanick: Thanks for the reply! I remember getting told something similar by an army recruitment officer at my school.
@darthkevin: Thanks for the info! And how exactly do you become an officer first? Also, I was planning to do something with biology/zoology so I don't think the army/marines could help me in anyway with that aspect haha.
@Bill T: Thanks for the info! Yeah, the brochures have never really answered any of my questions haha. How do you join guards? Are you able to go to a university while in it then transfer to the army once out?
@gsarchie: Thanks for the reply! And you're right, I might not like the military, but, I'd like to learn more about it. Do you think they have any biology related fields? Or is it mainly law enforcement types of jobs? Can you pick where you get stationed, or do you just get sent there? And thanks, your post was informative!
@Andybill: Thanks for the info! I've asked this around to some of my friends and family, but, what exactly is the benefits for joining the army/marines? I know health care is free and such, but, is there anything else?
@devildog_dk: Thanks for the info! Some of the kids in my school have taken the ASVAB, but as a senior in high school, I'm wondering if it's too late to take it. I can join ROTC next semester in my school, but, I doubt that will help anything.

Anyone can answer the questions that are directed at the other users, and I'd love to hear everyone's own input.
I'd really like to give it a shot, but, after my dad lecturing me about it, I don't want to go in for twenty years or so and then come back and be 'stuck' without a way to get a job. But, after I read the replies, it seems pretty (don't want to say easy since I don't really know how it is) simple to get a job.
I'm still curious to see if you would make enough money to retire after twenty years in service and it still seems to peak my interest a bit. And the guards is a bit interesting to me, as a user has said that you can join it and while in college and what they actually do. I do have a few military people in my family, my uncle was in the navy and my cousin was a guard, but, I don't think they know enough about it so asking them won't really be much of a help. And I've also heard you're sometimes able to keep pets, is this true? lol.

Thanks again for all the replies, I really appreciate it!