I am not trapped in a facility full of robots. You
are all trapped in here with me
— The Soldier surrounded by robots
The Operation Gear Grinder Badge is a cosmetic item for all classes. It is earned by completing your first mission of the "Operation Gear Grinder" Tour of Duty in Mann Up mode. It tracks a player's progress through the various Mann vs. Machine missions. The badge's level will increase based on the amount of times you've completed the challenges in Mann Up mode (level 100 requires completion of 297 missions).
October 9, 2012 Patch
- The model occasionally has problems rendering the translucent effects, causing only the center area to appear, while all the rest appears invisible.