This is a picture of one of four Iron Warriors armies that was at the 2005 Conflict Vancouver. The player who told me there were four Iron Warriors armies didn't seem to be happy about it. I took a picture of these Rhinos as they had nice Iron Warrior symbols painted on top.
Apparently an army that is easy to paint and has an advantage on the table top what with getting to take four heavy support choices and is even allowed to take them from other army lists is popular. Who'd a thunk it?