army unit - a military unit that is part of an army

army, ground forces, regular army - a permanent organization of the military land forces of a nation or state

Reserve Officers Training Corps, ROTC - a training program to prepare college students to be commissioned officers

division - an army unit large enough to sustain combat; "two infantry divisions were held in reserve"

body - a group of persons associated by some common tie or occupation and regarded as an entity; "the whole body filed out of the auditorium"

corps diplomatique, diplomatic corps, diplomatic service - the body of diplomatic personnel