Why Do We Keep Calling it the Iraq "War"?

Why do we call it the Iraq "War" still?

It's not a war. War is armies fighting armies. This is our Army (and Marines, and National Guard) fighting insurgents in a country whose armed forces we defeated and then disbanded. A country we conquered.

And of course, we know it's not a War because its Mission was Accomplished:

We need to call this what it is: the Iraq Occupation.