From the TWS Administrators:

Air Force is now in beta testing stage, Invites are
being sent out to those that have pre-registered,
During beta testing access is by invitation only.
Should be fully online Jan 01, 2008

Loyde Mcillwain
Senior Administrator
TWS Inc

If I were and AF type, I’d get over there and pre-register right away and get onboard.

The Navy - TWS has been a great tools to get in contact with old shipmates…

Update from Loyde in the comments:  you have to be invited to get in now.  Keep checking the site for use in Jan’08!