marshall

1. A high-ranking officer in the household of a medieval prince or lord, who was originally in charge of the cavalry and later the military forces in general.
2. A military officer of the highest rank in several countries, including France and the former Soviet Union; equivalent to a general of the army in the United States. See also field marshal.
3. A person in charge of the ceremonial arrangement and management of a gathering.
4. A federal lawman. (US)
5. An official responsible for signalling track conditions to drivers (through use of flags), extinguishing fires, removing damaged cars from the track, and sometimes providing emergency first aid.

Plural marshalls