I started to make a mission last year but never finished it,
I used Chern tho as the map and based it on an occupation, the player gets into a humvee as a gunner and drove around the map for some time before anything happened through towns filled with civs and traffic..then in one of the bigger towns an IED on a bus triggers when the first vehicle approaches and then some techincals, rpgs and small arms carrying opfor attack the convoy and the team has to fight through... that was as far as I got

But I quite liked the idea of being driven round for a bit before anything happens to try and catch you out before hell breaks loose

I got as far as the IED being triggered which allows the techincals and rpg guys to move.