I was enjoying a Sierra Nevada Torpedo or two (yum-oh) and reading The Complete Roman Army and this line jumped out at me:
It was a point of pride for the Romans to be willing to copy and employ the effective tactics or equipment of their enemies. . . .
This made me wonder: Have we copied any enemy tactics over the last decade? If not, is there a good reason (like the tactics are inhumane) or is it just the "casual arrogance" that Andrew Exum identified?