This is a scenario inspired by MGS4, and is ideal for an odd number of players.
Two enemy teams, PMCs and Rebels, and one lone operator.
The most skilled player is to act as the lone operator. He is to find his contacts to determine his objectives for the match. Objectives may range from: gathering a peice of intel, destroying certain emplacements, even killing a designated player(it's up to you really). The contacts can be judges or players that volunteer for the roll. He may have as many objectives as you want. If the operator is engaged he may fight or flee, it is his choice. Stealth for the operator is encouraged!
For the other teams you may assign objectives or make it a standard death match, its up to you. I recommend rebels be attackers and PMCs be defenders, but it is up to you. Both teams are enemies of the lone operator!
Winning Conditions: The Lone Operator wins only when his objectives are complete. The teams may win if they complete their objectives or kill the other team. A time limit may be set, and the match then may end in a draw if the time limit is reached.
Spawning is up to the players, and to be agreed on by vote. (Or whomever is in charge of the field may decide)
Feel free to add anything you think is missing in the comments.