Recently I've been playing some games in Nam, in 1965.
Some things have occured to me.
Unit 117 UH-1B Gunship, has 2 M60's, and two 2.75" FFAR's, with ammo 9HE.
Now I may be wrong, but shouldn't it have 2 lots of 2xM60? Each side had a pair of M60's linked.
Also it only seems to have 7 Rockets on each side, not 9.
And wasn't there a Version with a pair of mini-guns, replaceing the M60's, as well?
Here's just one page of the many thousands that can be found confirming the above:
http://incolor.inetnebr.com/iceman/