Nitpicky, but what ever happened to using snow camouflage on Army combat operations?

Amen, sir!

I've been working camouflage since I was a captain (and Nixon was President). The single pattern "solution" was driven by a perceived need to reduce the clothing bag; performance was secondary. It's a long, convoluted story beyond the scope of a site like this one.

As to snow camo: the Marines have a very effective snow overwhite (disclosure: I was involved in development and test) which is available to the Army as well. You can see it in "Avengers: Ultron" if you're curious.