D. Aarniokoski was a Starfleet officer in the 23rd century.
Aarniokoski was listed as a member of the Research and Development team on the dedication plaque of the USS Enterprise. (DIS: "Such Sweet Sorrow")
This character was only mentioned in writing.
This officer was named after Star Trek: Short Treks and Star Trek: Picard producer Douglas Aarniokoski.