Take a few minutes to read this Intel Dump post. It's the sort of informed, measured discussion of military affairs that's increasingly important during this election season.
Yes, American soldiers have recycled the enemy's weapons in every war they've fought. No, the frequency with which they're forced to do it in Afghanistan is not an excusable sign of "warfare as usual." Quite the opposite--it's yet another sign of how the war in Iraq has hurt the war in Afghanistan.
(Here's another piece of the story from ABC News.)