Using a stealth black hand, buy a nuke and carfeully make your way to the enemy war factory, wait for someone to build a vehicle (theres not a real need for something big here, an APC would be ideal however for it's speed, manuverability(ie./crushing power)anti-infantry capabilities and it won't draw much attention) after they buy it, quickly plant the beacon on the inside of the garage type dealy and get into the vehicle, don't fire at anybody unless they're trying to diffuse the beacon, you'll look real natural like in an APC just sitting there

It's pretty simple, but hey, it works!