Medal…?
The trick is, this isn't a hat or a medal. It's a commemorative sticker. Complete the Ready For Duty achievement in Team Fortress 2 to unlock.
Medal
Style: Participant
Finished Season 12 in rank #2,329 with a score of 1. Medal awarded to those who participated in any season of Heroes of the Interstellar Armed Forces. Aliens Killed: 67 Team Kills: 0 Successful Missions: 1 Failed Missions: 0
Medal
Finished Season 2 in rank #875 with a score of 389. Medal awarded to those who participated in any season of Heroes of the Interstellar Armed Forces. Aliens Killed: 3,196 Team Kills: 11 Successful Missions: 47 Failed Missions: 24