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Echo Six was a codename for an ODST stationed in Gyeonggi-do, to help test the MJOLNIR Mark VI armor.
Spartan-062, the first Spartan to test the armor, was sent in training with several ODSTs. During the armor testing, Spartan-062 hurls a paintball grenade onto the middle of the unsuspecting ODSTs, neutralizing Echo 1 through 5. The sole survivor of the blast, Echo 6, makes a run for it and was quickly gunned down by 062, but not before initiating the "Bulgoki Gambit".