Drop them both, then, when no one is looking, sneak the Driver over to the half-track. The Sniper must crawl into the center area until he has a shot on both of the soldiers atop the barracks. Also lure the soldier on the other side of the gate to his death. Distract the soldiers there so the Green Beret can scale the ridge and clear the area. The Spy must now run through the enemy's lines, to the area where the half-track is parked. Take the rest out by any means necessary, including pistols. Three or four soldiers will come to investigate. Once everything is ready, shoot the barrel and blow up another patrol.
The Sapper should place a trap east of the water tower. Then hide in the little building near the gate.
Use the Sniper to take out the soldier on the ridge to the east of the barracks.
