Most of these came from actual names... "Enduring Freedom" was the name of the action in Afghanistan, IIRC, while "Desert Sheild/Desert Storm" was the codename of the first Gulf War.

Apparently even bombing runs are being given codenames now; the "shock and awe" bombing run going on right now is being called "Exemplary Destruction" by the Department of Defense.

Yes, "Crusade" did get bad reviews when it slipped out there... I'm sorry but this time the reference is indeed too obscure for me to catch...