The 552 is the Military version that's NV compatible and takes AA batteries.
The revision is simply the generation. Kind of like a 2004 Honda v. a 2005 Honda. Basically the same with minor improvements. Rev F is the current model. Most dealers will only have the F in stock, having sold out of their older E (and previous) models.
Check with G&R Tactical for the best prices on EOTech.
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