Military Assault Command Organization

Military Assault Command Operations (or MACO) were a United Earth military organization in the early and mid 22nd century.

In 2153, General Casey, at the request of Starfleet Captain Jonathan Archer, assigned a detachment of MACO troops, commanded by Major Joss Hayes, to the starship Enterprise for its mission into the Delphic Expanse. (ENT episode: "The Expanse")

There were MACO posts in the city of Atlanta and the Janus loop. One of their training posts was at West Point in New York. (ENT episodes: "The Xindi", "Hatchery", "The Council")