L.T.
I read all the other posts, and there is some great advice. I just wanted to add too, that your "military" situation might also play into your son's reaction to you taking him to childcare. My husband frequently comes and goes in the Air Force and I found that in and around that time, my kids act strange! You're probably your son's only "constant," so when he sees you leaving him too, even if only for an hour, it probably throws him off track.
I agree that you should just keep doing what you're doing by taking him consistently. I think eventually, in another couple of weeks, he will catch on that that's just how it is, and maybe by then he'll be comfortable with the situation.
Good luck!