help with a mission Options

[Fatality]

ok here is what i need to know
1. how do you get passengers in a helicopter to ditch it when theyu spot a missile in the air?
2. after that how do you change the waypoints so the team can rearm at a weapons box (i plan for this to be over water deep enough so on their way to shore they lose their weapons)
3. and can you get them to get a different route back to the base?