Would it be heresy to wear dark blue camo BDU’s with black M3 armour instead of the standard movie colours?

That sounds like a pretty awesome combo to me!

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My entry-level prop and costume tutorials: viewtopic.php?f=3&t=12751

According to the Tech Manual, stuff could & sometimes did get matched to where people were deployed. My gear was all OD green. (since I couldn't paint for shit at the time)

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Hey now, don't be mean. We don't have to be mean, cuz remember..No matter where you go, there you are.

Combo should look pretty sweet dude.

I haven’t got any armour yet, but I rock black multicam for my uniform...

could definitely be mistaken for a cop

As stated above, all kinds of color schemes have been used and are welcome. There is plenty of precedent to roll however you like.
Seven's note is valid though. I don't necessarily think people will confuse you for a real life cop, but being recognized at all can sometimes be a "thing" (countless tales of us being called 'starship troopers', 'GI Joe' or one time I was even told "that isn't a very good halo costume"). That color scheme leads me to think you will get more guesses of Robocop or Archer than Aliens. (although the Archer one would be pretty accurate and hilarious!)


But do what you are comfortable with. As long as you are having fun then roll with it.

My plan has commenced, these are the ones i picked (which i’ll need to modify), and i plan on ordering some M3 armour from Spat soon

thats gonna look badass. imagine having a red LED in your shoulder lamp to go with that.
maybe a black pulse rifle.

just ordered ab pads and leg armour from spat, gonna wait a little before i get the m3 armour just for my wallets sake, but i’ll keep you updated!