You can access the Military Hardware mission in GTA 5 after you complete the "Paleto Score Setup" or the "Predator" missions. You can only play as Michael or Trevor on this one. The goal is to stop the military convoy which consists of two SUVs and a truck. The player must steal the truck that’s carrying the hardware.
Gold Medal Objectives:
- Kill 5 enemies with a headshot.
- Stop the convoy using sticky bombs.
If you don’t need a 100% completion, just stop in front of the truck. The first car will keep driving and you’ll be able to easily kill the truck driver and the rest of the guards when they come back.
Remember to not shoot the truck itself but the driver. Avoid blowing up the truck with the sticky bomb. Don’t try to steal the truck until you kill the guards because they will chase you otherwise.