David,
As you already know (from the project), in the Vietnam war there were many configurations for the attack Helicopters.
Before each mission, the Bn Commander decided what was the best configuration for that mission.
According to the material availability they could adapt in the UH-1B/C the following Armament Subsystem:
M3 armt subsystem
M5 armt subsystem
M6 armt subsystem
XM11 missile launcher
XM14 gun pod
XM15 dispenser
M16 armt subsystem
XM18 dispenser
XM19 dispenser
M21 armt subsystem
M22 missile launcher
M23 armt subsystem
XM26 missile launcher
XM29 armt subsystem
XM30 armt subsystem
XM31 armt subsystem
XM47 mine dispenser
XM50 armt subsystem
XM52 smoke generator
M59 armt subsystem
XM93 armt subsystem
XM94 armt subsystem
M156 armt subsystem
XM165 grenade dispenser
MINI-TAT turret
Sagami mount
and these subsystems included the following weapons:
24-tube rocket launchers
SS-11B anti-tank missiles
M3 .50 cal. machine gun
XM170 flares
quad M60C 7.62mm machine guns
flares or munitions
MK45 flares
7-tube XM157 or M158 launchers
AGM-22B anti-tank missiles
M60D 7.62mm machine guns
TOW anti-tank missiles
XM140 30mm gun
M24A1 20mm cannon
XM2 anti-personnel mines
M5 40mm grenade launcher
atomized fog
M60D 7.62mm machine gun or
M213 .50 Cal. machine gun or
XM175 40mm grenade launcher
M134 7.62mm "minigun"
M129 40mm grenade launcher
7-tube M158/M158A1 or
19-tube XM159/ M200 launchers
CS smoke grenades in XM15 cluster
Now... I am positive that you could find several units of UH-1B/C in the stock OoB with different configurations, but as you understand this would create an endless list of units with almost similar characteristics.
Instead, what you find is a generic unit that combines most of the above with a well balanced configuration for a gunship.
IMO, the current configuration for the UH-1B gunship is very good.
Also the next gunship (1967-1972) AH-1G Cobra has also a very good configuration.
The only thing that was missing was the Aerial Rocket Artillery helicopters, and as you already know they will be included in the next patch.
Also if you wish to have an attack helicopter with Miniguns you may change/modify the current weapons since the ammo data fits both the Miniguns and the M60s!
cheers,
Pyros