Tom Clancy's EndWar

This may take some practice. Each Command Vehicle is deployed with 4 sentry drones that will follow it around for protection. Essentially, you must fully kill 10 enemy units using these sentries. The issue is that they don't do much damage and are very fragile. First, spend some Command points on upgrading the sentry units. To boost, your best bet here is to have your boosting partner deploy Gunships and send them to you one at a time. Gunships will not always attack Command Vehicles on sight, which makes them easy pickings. If you find the Gunship is attacking, your partner should continuously move the unit from one spot to another. They will not shoot while moving. A full squad of four sentries should not have too much trouble downing a Gunship. The more challenging part is then killing the Gunship after it has been downed before the evacuation helicopter arrives. You have a limited amount of time to do this so order your Command Vehicle to attack as soon as the Gunship hits the ground. If you do not fully kill the Gunship, you will not get credit. The trophy will pop when you've killed your 10th unit using the sentries.