hinglemccringleberry

Hey, I gotta say I'm lovin the mission but I'm just so confused on somethings. I'm playing the coop version. How do you direct the transport chopper to go somewhere? I called it in and got in but I can't figure out how to direct it. And how do you rearm things like launchers, I got the ammo resupply truck but it only replenishes gun ammo? And can you only access the arsenal once? If anyone can help I'd appreciate it!