From this link "The US constructed its largest pre-positioning base outside the US in Qatar. Facilities were constructed in Qatar to support CENTCOM's prepositioning of military assets in the Central Region, in accordance with government-to-government agreements. The work is for both the Army and Air Force...< snip>The Army's newest and largest pre-positioned stock (prepo) facility opened in Qatar in August 2000."
In addition there are fully functioning Air Force bases in both Qatar and the UAE. Don't think that Pentagon planners haven't seen the possible eventuality of a Saudi uprising and taken steps to prepare.
I'd be much happier if there was an armor and a mech battalion with all that equipment. An air force base can't fight off a coordinated combined arms attack. All that equipment may even make it a more appealing target...they'd have to hit it quick.