I am not trapped in a facility full of robots. You
are all trapped in here with me
— The Soldier
The Operation Steel Trap Badge is a cosmetic item for all classes. It is earned by completing your first mission of the "Operation Steel Trap" 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 594 missions).
August 15, 2012 Patch (Mann vs. Machine Update)
- [Undocumented] The Operation Steel Trap Badge was added to the game.