Senior G.U.N. commander directing military responses.
Tom impersonates Walters.
Tom disguises himself as Walters to steal the second keycard.
Internal G.U.N. conflict.
Both are high-ranking G.U.N. officials; Rockwell turns against Walters' allies.
Walters provides crucial backstory.
Walters informs Team Sonic about Shadow's past before dying.
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