Now, go to the stated location, and you will identify a mob upon reaching the mission marker location. You will then need to follow the mob to the warehouse or wherever the assets are secured.
Keep an eye out for the detection meter at the bottom-right corner of the screen. You will not have a lot of issues considering you're already quite high enough in the air for the mob to detect you. But, if you are too close to the road, the detection meter will start to fill. Keep your distance, and follow the mob to the asset's location.
When the mob reaches the warehouse, they will enter the warehouse. Land your helicopter and enter the warehouse. But, before entering the warehouse, ensure that you've equipped a weapon.
When inside, quickly get into cover, and take out the enemies.
After eliminating the guards, use explosive weapons (RPG, Grenade, etc) to destroy the ammo crates (assets) inside the building.
After destroying the assets, place the charges at the indicated areas, and exit the building.
This is where the helicopter comes in super handy. Quickly get into your helicopter, and lose the cops to complete this mission.
Check out our main The Contract hub for more Security Contracts.