The other issue I have is that it calls out "this" war. Are we to believe that the driver is fine with other wars? Are they Civil War reenactors afraid to offend their peers? It's possible, but I doubt it.
If you want to say "end this war", just say it. If you want to say "end war", I applaud you. And if you do, in fact, have a "endless war" on your car or tank, I hope I never cut you off in traffic.