For the mirror universe counterpart, please see R. McCallum (mirror).

R. McCallum was a Starfleet officer in the 23rd century.

McCallum was among the members of the Science Ops team listed on the dedication plaque of the USS Enterprise. (DIS: "Such Sweet Sorrow")

This character was only mentioned in writing.
This officer was named after storyboard artist Rob McCallum.
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