the alley Vipers,.. depends on how many you have.
SInce they have a distinct uniform, kinda Flash Gordon-esque, I would have a mix of Marauder Colonial Marine Rifles and Pulse Rifles (with the M-4 silencer Attachments) adds Kinda a futuristic flair to them.
Otherwise, Id hit them with the Modular sets (Scar, NVR rifles, with various attachments) and a few armed with some of the S.W.A.T. Battering Rams and shields (repainted to match the uniforms)
Desert Scorpions definetly need the modular Bayonett and Saw attachments, along with the Marauder knives.
as for the Freefall "Troopers" a mixture of Uzis with silencers, Mp7s and M-4 ebr rifles along with the shethed knives (attached to the rig harnesses)
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- Sir William Drummond
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- Aristotle."