; (2) fifth-generation and fourth-generation combat aircraft; (3) fifth-generation and fourth-generation combat aircraft and appropriate support aircraft and other network nodes for command, control, communications, intelligence, surveillance, and reconnaissance purposes; and (4) fifth-generation and fourth-generation combat aircraft and their associated network-enabled precision weapons. (b) Additional plan requirements The plan required by subsection (a) shall include— (1) nonproprietary and open systems approaches compatible with the Rapid Capabilities Office Open Mission Systems initiative of the Air Force and the Future Airborne Capability Environment initiative of the Navy; (2) a competitive acquisition process, to include comparative flight demonstrations in realistic airborne environments