just walk into whatever personnel office handles these things on your post with your current ID and another form of identification, they'll print you a new one right there.
If your spouse isn't with you then you need a Power of Attorney as well as 2 pieces of ID (expiring card doesn't count, so it would have to be Driver's license, passport, SSN card, etc...)
If he is with you then you just need the 2 pieces of ID.