I have a plan for my group's next mission which will involve a very long engagement in which they're moving with at least sniper fire and grenades being thrown their way. There will be ambushes and other sorts of fun which will require structured mode but for the most part it's not feasible to do so.
I was planning on having a BS and Perc test rolled for each character and then counting up the groups ° of success of failure to determine how well they deal with the constant attacks; from them being wounded and comrades dying to getting through relatively unscathed.
But seeing as how this is going to end up happening a lot I was wondering how other GMs managed it.