Clexton27 replied the topic: Special Personnel (Exp#2)
I can see no reason why it would not benefit from this card. As it is also able to "Crossfire" with other Machine Gun Units.
The Text of the Machine Gun Barrage card states: All ordered units with machine guns may combat twice (ranged and/or close) and will roll 1 additional die this turn.
Units ordered to combat twice may not move or take ground this turn.