These two website links below, that contain a lot of Bird Dog info and pics (along with the Ravens), might serve to enlighten a number of the above posters.
The USAF Ravens and the Bird Dogs
Bird Dog photo gallery
The M60 machine gun was apparently mounted under the LH wing for night missions.
The M60 front bipod support legs can be easily and quickly folded in or out, and shortened as well.
M60 intimate details
I must say I'm pretty impressed with the size of the rocket pods fitted, and I wouldn't like to hazard a guess at what it did to IAS, when any number of rockets were fired!
EDIT: I don't think the round in the bandolier are M79 grenade rounds, as they appear to be too long. The M79 grenade was actually quite stubby, and didn't have a lot of range.