There is some inconsistency regarding his rank: General Chase refers to him as "Colonel Patterson" whereas his own terminal greets him as "Lieutenant Patterson". This may be due to a field promotion, or multiple field promotions, as traditionally Colonel is a higher rank by several pay grades. Therefore, the computer has not been updated since his arrival at Anchorage. Such a change wouldn't be unexpected as the large losses sustained by American forces would cause a shortage of good officers, with commanders promoting on the spot to fill ranks. It is also possible that Patterson was promoted posthumously after being killed in action. Therefore, General Chase would refer to him by his new rank out of respect, but his terminal would likely not have been updated yet.