The Operation Gear Grinder Badge is a cosmetic item for all classes. It is a transparent disk featuring a transparent bald eagle facing right with its wings open and a transparent bomb hanging on two chains.
This item is awarded to players when they complete their 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, and its level increases based on the number of Tours completed.
October 9, 2012 Patch
- [Undocumented] The Operation Gear Grinder Badge was added to the game.
- The model occasionally has problems rendering the translucent effects, causing only the center area to appear, while all the rest appears invisible.