each one and steal the bike found there. one will be parked near the airport. another can be found parked next to the police building, and the last one will be found outside the v-rock hotel.
drive up at about medium speed and the bike will be attached. then just find another car and head to another dot. you have 12 minutes to finish this mission, but you should really only need about the guys need to steal an armored truck which is usually used to transport money safely.
kill the one soldier standing by it, then run into the red circle and push triangle to get on the gun.
fly it to 