REWARDS - $1,000
Get in the BF Injection outside and head to the yellow marker on the radar. When you get there, Toreno will say some stuff. He tells you to pick up the rocket launcher on the porch and get into one of three vehicles, then head over to the new blip. The red marker is on top of the arch in Arco del Oeste, so get to the marker and park into it. CJ will automatically set off the flare.
You'll see the chopper coming, but there are some agency choppers coming in as well. You'll need to shoot down 4 agency choppers before this part is over. If you need health or more rockets, then they're located in the two shacks nearby. You must watch the chopper's health via the meter on the screen. The agency choppers may drop some men from time to time, so be careful since you'll face threats from air and land.
When the final chopper goes down, the contraband one will drop its package via parachute in some location. Get into your vehicle and head towards the green blip. You'll find the package next to a cabin and another speaker. Once you pick up the package, Toreno will tell you to bring it back to the hideout. Follow the yellow blip on the radar to the hideout. Once there, drive onto the red marker in the garage to finish the mission.