You need to have Rank 3 in Iron Banner, and then it may show up as a random drop from IB matches. 184.108.40.206 00:43, October 14, 2014 (UTC)
I got this jumpship while I was playing the Crucible in the Beta (not Iron Banner). I was just playing a regular old Crucible match and I got it as a random reward. I remember my friends making fun of the ship when I equipped it, calling it a "box".