Wait until you've finished looping though all the players before destroying the units, put all the units in NotPlaying_Group into another group, then destroy NotPlaying_Group.
After you've looped through the players, all the "non-playing" units should be in one group... DESTROY THEM, then DESTROY THE GROUP!!
Sorry, got a little carried away there
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BoNes
"To kill one is a tragedy, to kill 10,000,000 is a statistic"
-Joseph Stalin