Does the DOD have a clue?

They've banned removable media such as CDRs and flash drives because of a virus or worm that is spreading on their network. First, I would think that regular flash drives would not be permitted to be used on classified systems, at least at a minimum, they don't use the same flash drives on classified and unclassified systems. Second, it seems that if the systems were secure in the first place, this sort of thing wouldn't happen. All of the good details are classified, but I bet keeping them classified has as much to do with the possibility of embarrassment as it does with actual security. If the public knew just how insecure their systems were, some folks would actually have to answer for it.