Marshal

From Memory Alpha, the free Star Trek reference.

Marshal was a military rank, the equivalent of which was used by the service organizations of many civilizations. As a traditional grade, marshal was the most senior flag officer rank possible in an organization (a marshal outranked a general or admiral).

The rank of marshal was usually reserved for wartime or very large military forces. In comparison to other ranking systems, this rank was somewhat equivalent to the Cardassian Union's quasi-military legate title. During Earth's Second World War, "five star" generals and admirals were created to give America a rank equivilent to that of Marshal. Douglas MacArthur was one such American general who presided over the surrender ceremony of Japan in 1945 (DS9: "What You Leave Behind"). A german equivalent of the rank was a title known as Reichsmarschal, held by Luftwaffe commander Hermann Göring. (ENT: "Storm Front, Part II")

On the planet Ekos, the Federation historian John Gill established a recreation of Nazi Germany, complete with an SS security organization. The commander of the SS held a type of Marshal rank, indicated by a wreath oak leaf insignia worn on both collars. (TOS: "Patterns of Force")

The Q-entity once took on the appearance of an old Earth marshal, in a French uniform, to which Captain Jean-Luc Picard replied: "A Marshal of France... ridiculous!" Starfleet officer William Riker had a more analytical approach, noting that, as a marshal, Q outranked his previous disguise as a Starfleet admiral. (TNG: "Hide and Q")