USAF!
USAF TAC service. Two GAU-8 and two Vulcans in nose. Rocket pods under wings. Tomahawks, Mavericks, JDAMs, dumb bombs in bomb bay.
USN patrol/ASW. At least on GAU-8 in nose. Harpoons, torpedoes, sonobuoys, whatever else in bombay.
Tail guns and maybe top turret. Bottom turret ?
New idea.
How about turret nose with GAU-8 and a bay to accept any of Bushmaster, Vulcan, M39, 50 cal, 7.62 mini gun depending on mission.