For all the time and frustration that humans expend interacting with computers, it is surprising that more attention is not paid to the impact the computers used by armed forces might have on security and peace. The military, like the rest of us, is dependent on its computers and interacts with them unceasingly, often in critical situations. Never before have our armies been so intimately dependent on their tools, certainly not ones as complex, or as apparently capricious as misapplied computers can be. This paper looks at the ways in which this peculiar human involvement with computer systems requires special attention, most critically in the military context, from policymakers and researchers.