The front seat is the aviator:
http://en.wikipedia.org/wiki/Naval_Aviator
The back seat is the flight officer:
http://en.wikipedia.org/wiki/Naval_Flight_Officer
The difference between twin-seat or single-seat determine who do what tasks (Single-seat do everything on his own while twin-seat will have the assistance from the back).
2009-11-27 08:53:07 補充:
With or without AWACS will not resolve the issue at all, since AWACS can't help the aircraft to evade missile at all.