Off by ... some
A common error, well, common enough that I've made it more than once (meta-pun), when writing code is to be off on some walk through a data structure composed of more than one element, such as an array (or the cement sections of the sidewalk when walking while thinking of something else), is to walk off the end of the array and into the road directly in front of the passing bus of error experienced.
Yesterday the Regime's internal prediction for US forces in Iraq in December 2006 was declassified and published.
How does 5,000 men and women under arms sound?
This is wicked fun reading. This is what the mental cluster ... intercourse of "Support the Troops" leads, to wicked big "off by sums".