Heh, that happened to me once... but what felt worse was when it happened with the four Hyperion Assassins. The Spec Ops skin is a very rare drop, but when the last assassin finally dropped it, I only saw it for a second as his corpse, and the skin, slid off the edge into the bottomless pit of despair.
At least the Bunker is more fun to fight, and actually yields a worthy amount of XP. The four assassins are brain-dead boring.
I really need a 'Punch-People-Through-The-Internet' button to respond to all of the stupid crap some people post.
Happened on my Commando too, shot the loot out and faced backwards. But somehow landed most of the loot on the side of the cliff on the way down to the fast travel station. I've only had it happen once though.