This article is about the ODST. For the Sabre pilot, see Echo 1.

Echo One 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 hurled a paintball grenade into the middle of the unsuspecting ODSTs, neutralizing Echos One, Two, Three, Four and Five.[1] The sole survivor of the blast, Echo 6, made a run for it, but, was quickly gunned down by 062, but not before initiating the "Bulgoki Gambit." After Spartan-062 was finally subdued, she was brought back to the Special Ops Center, accompanied by Echo One and his ODST companions (whom all had Tactical Training Marks on them).