Not sure if this will help, and others can feel free to correct me, but a little extra knowledge might help you draw your own conclusions.
The main thing to take note of is what type of aircraft they were. A whole bunch of Apaches with Little Bird spotters is way different than people movers. If they were Blackhawks, Hueys or Chinooks (the big, double blade jobs), then they're going somewhere to pick people up or drop them off.
7 Blackhawks can shoehorn what, 7-8 grunts each? So, 49-64 groundpounders maximum delivered somewhere? That's a platoon
Small (not as small as the hospital emergency ones), dark, single prop
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