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GASO

From Halopedia, the Halo wiki

The GASO rank as seen on Halo Waypoint.

GASO ("Gold All Skulls On") is a Halo: Spartan Assault exclusive ranking that can be earned by getting a Gold ranking with the Thunderstorm and Black Eye Skulls on. This challenge is only visible on the Halo Waypoint service record for Halo: Spartan Assault.