Interesting. I was starting wonder if the drop rate was really really low for this ship, and this thread indeed confirms it. After they re-did the Y1 ships, I got all the DO ships for my Hunter in one week. During the same time, I got the NM Armor of Vows and Visible Hand in one week on my Warlock, but no Comitatus. I have gotten all of the shaders, emblems, armor, and weapons multiple times over, but that ship still eludes me. It's the only ship that I really like, but I rarely see it in fireteams/matchmaking/etc. Only a couple of the people that I play with have it.
Meh im about to give up honestly, ive been spending all my resources on nm level ups since ttk came out, went from level 13 to 164 and i still dont have that ship, it feels wrong... at some point they should start increasing the odds to drop it