Andy,
Think HAL-3. I believe every detachment had at least one 50 cal armed gunship:
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I have a bunch more of HAL-3 but you get the idea. As far as Army goes, think Nighthawks and Fireflys. These were perimeter defense birds equipped with either C-130 landing light clusters (Fireflys) or Starlight scopes and Xenon searchlights (Nighthawks). Many, but not all, had a 50 cal in one door. Here's a few shots for ya:
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There were other one-off Hueys with 50 cals as well. Also, smoke ships frequently carried 50 cals for some extra firepower when flying low and slow in advance of a CA in a hot LZ. Hope that helps.
Ray
I found a couple more for ya:
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