Go to the Outpost Kyra Tea Weigh Station
, the Coordinates are X: 345.0 Y: 380.0. Buy an RPG-7 (Cost $160.000) and replay the Outpost via Outpost Master. The Targets are the two reinforcements Trucks. Let the Enemies activate the Alarm and defend yourself until the reinforcements arrives. Select the RPG and wait that the Trucks stand still and the reinforcments get out, if this happens, shoot with the RPG.