Deputy Director Milbrook was Avery Bullock's predecessor at the CIA.
When Agent Crisp of CIA Internal Affairs fears Bullock is losing his mind in "The Full Cognitive Redaction of Avery Bullock by the Coward Stan Smith", he plans to have his memory erased and enlists Stan Smith to help. Stan has concerns about the effects of the procedure which Crisp brushes aside, making note of the smile on Milbrook's face as he is pushed around in a wheelchair at CIA Headquarters.