Are you still connected in any way to the military--such as RESERVES OR NATIONAL GUARD--if so I would definitely think that they can call you up--so resign from those organisations if possible. Another thought when you were processed OUT did you receive anything indicating termination of service such as an HONORABLE DISCHARGE CERTIFICATE--if so you are okay I think
Suffice it to say that anyone trying to predict what the military can or cannot do is attempting to weave through obscure reams of rules deliberately designed to obfuscate.