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A list of William "Buck" Rogers's aliases used during Earth Defense Directorate operations is provided below.
- Rafael Argus: Rogers assumes this identity after incapacitating the actual Argus in a tavern shootout (BR25: "The Plot to Kill a City")
- Harper V (Harper 5): Rogers uses this alias when goading Rafael Argus, noting that Argus killed his brother Gleeson some 3 months prior (BR25: "The Plot to Kill a City, Part I")
- Aron Wist: a false fallback identity Rogers is provisioned, in the event that his first cover is blown; its use allows Dr. Elias Huer and Defense Directorate personnel to apprehend the treacherous turncoat Harsteen (BR25: "The Plot to Kill a City, Part II")