I felt like posting this because, after I hit Commander, I ws testing on which weapons and items I could get at my current rank. I found this info on another site and wanted to post it here, as well as requesting it to be stickied so others who hit a new rank aren't confused as I was.

Ensign / Lieutenant = MK I and MK II
Lieutenant Commander = MK III and MK IV
Commander = MK V and MK VI
Captain = MK VII and MK VIII
Admiral = MK IX and MK X
Comments
At least, until it gets buried. However, I will help you with a free bump.
I know that's a risk, but that's one reason I requested a sticky in the topic.
Thank you, my friend!
That only works for those of us who actually read everything in the popup window:p
hehe You guys are both right; to be honest, I never noticed the rank name until someone in here mentioned it.