Before rules changed a time ago I had mamaged to get the Shock Trooper and had upgraded to level 4.
Since then, I have achieved one upgrade - an upgrade from lev 4 to lev 5 through 3 stars on a heroic defense.
I am about to attempt to get the lev 6 upgrade by reaching the ultra-chrome league in the current Tatooine Conflict. (Though I have only ever reached Obsidian League twice in every conflict I've been in)
(-:- Eidolon -:-)
Sith'n'Slytherin - Squad Leader
HQ: 10 / Donated: 14,346 / Reputation: 1,089 / Base: 2,792 / Medals: 17,857 / Atk: 2,239 / Def: 333 / Joined: 2015-02-15