I believe the military part has a 20yr mark, but as suggested hit the Military divorce forum on this site for confirmation. I could be wrong about that part.
Newsflash to your husband, but he doesn't get to decide whether or not you are awarded alimony - the judge does. You have a long term marriage so you *will* get an alimony award; likely with a stipulation that it ends at a certain point, and that you take that time to complete your education or obtain employable skills. If you're healthy and capable you should be supporting yourself at some point - the marriage is over so his supporting you will be too.
One other thing though, is that your husband is going to be in for a rude awakening. SC I NOT a no-fault state. You can sue him for divorce on the grounds of adultery and he will be penalized for it in this state. It's not like he can deny it with the living, breathing proof wandering around.
Never, NEVER, listen to the divorce advice given to you by the person you're divorcing. They will tell you whatever serves their best interests, not yours.
Marriage doesn't come with a money-back guarantee.