Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
It could be something completely different. A preproduction or prototype M923 was designated and M956 as described in this thread: http://www.steelsoldiers.com/showthread.php?11738-Prototype-5-ton-6X6-M956
I searched for this since I recently got to see one (an M956).