The Waze navigation app has partnered with Microsoft and 343 Industries, the studio behind the Halo series, to celebrate the video game’s 20th anniversary.

Waze users will be able to choose voices from the game’s two main factions, the humans of 500 years in the future or a brutal alien army called The Banished.

If you pick the human side, you’ll get directions from the game’s main character, Master Chief, otherwise known as Spartan-117. Your car’s avatar in the app will also be changed to the famed off-roader from the series, the Warthog.

Read Also: Warthog Deploys From The Halo Universe To Forza Horizon 3

If you prefer the aliens, you’ll get directions from Escharum, a war chief for the “Banished.” With him, you’ll also be able to pick a Covenant Ghost as your vehicle avatar, a hover-bike that is a fixture in the Halo series. You can hear examples of both characters’ voices as they will appear in the Waze app at xbox.com.

People using the app will be able to get directions from those characters in English, Spanish, French, or Portuguese. All are available for a limited time through the Waze app‘s customization menus.

Along with celebrating Halo’s 20th anniversary, the Waze customizations celebrate the latest entry in the series, Halo: Infinite, due out this holiday season.