In the absence of information or intelligence, commanders and planners must often use a "reasonable man" approach to operations. Given the fact that the US has a prison population of 2.5 million people or roughly 1% of the population, which does not include those on probation or parole; is it not reasonable to assume that Iraq also has 1% of its population living "outside" the rule of law? Using this formula, an Iraqi population of 26 million has 260,000 criminals, passive and active insurgents, and pure-terrorists. Given an alien population of 13 million in the US, or 4% of the population; Iraq would have an alien population of over 1 million of which some undetermined number are foreign fighters.