[Update 14.8.1: Operation Gate Crash (+Hotfix)]

I was Solo when I got it.  Being online may throw the counter off by just enough.  Its not that easy to get.  I thought I had it several times and I saw this thread so I thought I was experiencing the glitch also, then I got a Charger with the primary, crawler with despair, and melee'd the osprey and the Trophy popped up.

What is your current exposure level?