(adsbygoogle = window.adsbygoogle || []).push({}); Does it even double for completed challenges?
Say you're at 990 kills in a game, and you have 10 kills away from Maximum Proficiency on your weapon.
You get those 10 kills, so both challenges pop up at the same time, 20,000 XP normally, will it be 40,000 XP?
Or does it only double for kills?

All double XP you earn is double, only challenges still remain the same

p.s. Congrats on your bronze star

And I read in another thread that weapon XP isn't doubled?

Well I spoke with Wondoh and it seemed like he was pretty sure it isn't... :p