Wildcat Destabilizer
From Halopedia, the Halo wiki
Wildcat Destabilizer is a Bungie.net multiplayer medal available in Halo: Reach. It is earned by destroying a generator in Firefight with the help of your teammates. It is represented by a generator on top of a gold twelve-pointed star.[1] The medal does not appear in-game and can only be viewed on Bungie.net.
On March 31, 2012 Bungie.net ceased updating Halo game stats and player records, transferring all record-keeping responsibilities to Halo Waypoint.[2] As Wildcat Destabilizer could only be viewed on the site, it is effectively no longer awarded.
Trivia
The name of this medal is a reference to Halo: Combat Evolved level The Maw, where the Master Chief initiates a "wildcat destabilization" in the UNSC Pillar of Autumn's fusion drive.
Sources