In Five Night's at Freddy's: Security Breach, one of the main missions and milestones in the story is decommissioning Chica.
Taking out the horrifying bird not only allows Gregory to use her voice box as an upgrade for Freddy but also advances the story quite a bit. Here's a breakdown of how to decommission Chica in FNAF: Security Breach.
How to Decommission Chica in FNAF: Security Breach
Being that FNAF: Security Breach is the first open world, survival horror game in the series — as well as the less than desirable save system and extensive amount of bugs — it certainly makes a lot of sense that there are many players who are struggling to figure out how to complete certain missions.
One of those has been "Dumpster Diving," which tasks players with decommissioning Chica. While this sounds pretty straightforward, it is easier said than done for most as there are several areas to hit and objectives to complete with little guidance given in-game.
Ultimately, players will need to lure Chica to the trash compactor in the kitchen near the loading docks exit, and press a button to trigger a cutscene and crush her.
In order to lure her in, however, players will need to pick up a tub of pizza-flavored ice cream (aka Monty's Mystery Mix), which is located in the Bowling Pass-locked Bonnie Bowl.
As such, it is recommended that players first use their Party Pass clear the Fazer Blast area, as not only does doing so grant the lifesaver Fazer Blaster, but also the Bowling Pass can be found in the security office of the Fazer Blast Arena.
In Bonnie Bowl, Monty's Mystery Mix can be found in the back of the ice cream parlor. It is in a present sitting on top of a rectangular metal box at the end of a hallway.
Finally, head back to the trash compactor. Near the opening of the trash compactor, a prompt will appear instructing players to place the Monty Mystery Mix.
After that, press the Freddy-shaped button attached to the metal table across from the compactor to trigger the cutscene.