I feel that General Ham may be either speaking out of turn, which is highly unlikely, or is playing a part in gauging Gaddafi's response to the threat of troops coming into country. Both Gates and Obama have made it clear that no troops (besides the CIA?) would be deployed in Libya, so I think this may be an opening gambit in diplomacy that we do not see. There is currently an admin envoy in Benghazi and a former senator in Tripoli talking to Gaddafi, so I doubt it is a mistake that this statement was made at this time.
Though, a threat without the reality that it will be backed up is no threat at all, so I would suspect we see some troop deployment to the region soon. I'm just hoping it is only a threat and diplomatic gambit, of course. Otherwise I'll be really P.O'd.