OV-10A/D "Bronco"

OV-10A/D/D+ "Bronco"

Various weapon/fuel tanks combination, taken all from the available pictures

The info says that the 100gal underwing fuel tanks were only used on ferry flights to/from Gulf.
The most common load was 2 LAU-7/A adapters and one AIM-9L Sidewinder + fuel tanks/rocket pods on the fuselage/sponsons hardpoints.
There is also info about using SUU-25F/A flare pods with either LUU-2D/B flare with visible light or LUU-2B/B with IR light.
The flare pod looks like LAU-10 pod, more info HERE.

OV-10D+ (unknown BuNo., on the way to Gulf) (sand/brown/grey camouflage, sand/brown underwing tanks, grey centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		FPU-3/A AERO 1C Fuel tank 150 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (BuNo.155494) (sand/brown/grey camouflage, sand/brown/grey underwing tanks, grey centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		FPU-3/A AERO 1C Fuel tank 150 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (BuNo. 155483 and 155489, taking off of aircraft carrier, on the way to Gulf) (lizzard camouflage, lizzard camo underwing tanks + centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		FPU-3/A AERO 1C Fuel tank 150 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (unknown BuNo. (probably UU-06), on the way to Gulf) (lizzard camouflage, lizzard camo underwing tanks, zinchromate primer centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		Fuel tank 230 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (BuNo. 155473, on the way to Gulf) (sand/brown/grey camouflage, sand/brown camo underwing tanks, grey centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		Fuel tank 230 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (BuNo. 155483) (lizzard camouflage, lizzard camo underwing tanks, grey centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		Fuel tank 230 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10D+ (BuNo. 155494) (superior grey camouflage, light grey underwing tanks, green centerline tank)

Wing	Stub wing	Center		Wing
Fuel tank 100 gal		FPU-3/A AERO 1C Fuel tank 150 gal		Fuel tank 100 gal
	Outer		Outer
	Inner		Inner

OV-10A (BuNo. 155428) (grey centerline fuel tank)

Wing	Stub wing		Center	Stub wing		Wing
LAU-7/A			FPU-3/A AERO 1C Fuel tank 150 gal			LAU-7/A AIM-9L
	Outer	LAU-10 4 x WP rockets		LAU-68D/A	Outer
	Inner				Inner

OV-10D+ (BuNo. 155473) (sand/brown underwing fuel tanks, green centerline fuel tank)

Wing	Stub wing		Center	Stub wing		Wing
Fuel tank 100 gal			FPU-3/A AERO 1C Fuel tank 150 gal			Fuel tank 100 gal
	Outer	LAU-10		LAU-68D/A	Outer
	Inner			LAU-68D/A	Inner

OV-10D+ (BuNo. 155473) (green centerline fuel tank)

Wing	Stub wing		Center	Stub wing		Wing
clean pylon			FPU-3/A AERO 1C Fuel tank 150 gal			ADU-299 adapter LAU-7/A AIM-9L
	Outer	LAU-68D/A 7 x WP rockets		LAU-10 4 x WP rockets	Outer
	Inner				Inner

OV-10D+ (from pic of BuNo. 155494, base tour for Vice President, Mr. Dan Quayle) (grey centerline fuel tank)

Wing	Stub wing		Center	Stub wing		Wing
ADU-299 adapter LAU-7/A AIM-9M			FPU-3/A AERO 1C Fuel tank 150 gal			ADU-299 adapter LAU-7/A AIM-9M
	Outer	LAU-10 4 x WP rockets		LAU-10 4 x WP rockets	Outer
	Inner				Inner

OV-10A (from Youtube video)

Wing	Stub wing		Center	Stub wing		Wing
ADU-299 adapter LAU-7/A			FPU-3/A AERO 1C Fuel tank 150 gal			ADU-299 adapter LAU-7/A
	Outer	LAU-10 4 x WP rockets		LAU-10 4 x WP rockets	Outer
	Inner				Inner

OV-10D+ (info from Dan "Pigpen" Ahearn)

Wing	Stub wing		Center	Stub wing		Wing
ADU-299 adapter LAU-7/A			Fuel tank 230 gal			ADU-299 adapter LAU-7/A AIM-9L
	Outer	LAU-10 4 x WP rockets		LAU-10 4 x WP rockets	Outer
	Inner	LAU-68D/A 7 x flare rockets			Inner

Info from Mr. Dave Ahearn, pilot who flew the Broncos in Gulf:
We (VMO-2) carried the M60's for a few days and quickly realized they were of no tactical value. They were difficult to arm and de-arm, so we took them out.
Weight was not really a consideration. We were typically above 15K, the M60 was of no benefit. VMO-1 flew with them as far as I know.
I recall we initially carried 2 Sidewinders, but the jet guys got a bit possesive and we settled on the one. (From the start they used the M version, but they were diverted to fast-movers, and L version was used)