The Decimator Tank was modified for the mission in the sense that it cannot be mind-controlled (so was the Battle Fortress). The fan campaign was about the Allies building a counter to Yuri's mind control technology - post-MO2.0.
Still, Aegis Impervious remains the only mission I had created and could not beat (not that I had a big portfolio anyway). I beat Singularity after about 30 tries. This one had much more. Maybe 60. I lost count.
Edited by lovalmidas, 20 June 2014 - 04:37 PM.