Admiral Marcia Meldal-Johnsan was a Starfleet Command flag officer of the 24th century.
In 2364, she supported an order that modified the survey missions of both the USS Puget Sound and USS Ganymede in Sector 450. These modifications were for diplomatic reasons relating to negotiations with the New Zealand government. She requested that the captains send acknowledgement of receipt of the order through subspace com net security mode 045, code 100 alpha. (TNG: "Conspiracy" okudagram)
This character was only mentioned in writing.