types:
army corps,
corps
an army unit usually consisting of two or more divisions and their support
division
an army unit large enough to sustain combat
battle group
an army unit usually consisting of five companies
regiment
army unit smaller than a division
brigade
army unit smaller than a division
battalion
an army unit usually consisting of a headquarters and three or more companies
company
small military unit; usually two or three platoons
platoon
a military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant
detachment
a small unit of troops of special composition
van,
vanguard
the leading units moving at the head of an army
section
a small army unit usually having a special function
squad
the smallest army unit
troop
a group of soldiers
troop
a cavalry unit corresponding to an infantry company
musketry
musketeers and their muskets collectively
foot,
infantry
an army unit consisting of soldiers who fight on foot
WAC,
Women's Army Corps
a women's army corps that was organized in World War II but is no longer a separate branch of the United States Army
bodyguard
a group of men who escort and protect some important person
patrol
a detachment used for security or reconnaissance
picket
a detachment of troops guarding an army from surprise attack
press gang
a detachment empowered to force civilians to serve in the army or navy
provost guard
a detachment under the command of a provost marshall
rearguard
a detachment assigned to protect the rear of a (retreating) military body
squadron
a cavalry unit consisting of two or more troops and headquarters and supporting arms
shock troops
soldiers who are specially trained and armed to lead an assault
trainband
a company of militia in England or America from the 16th century to the 18th century
battery
group of guns or missile launchers operated together at one place
paratroops
infantry trained and equipped to parachute