Unit

A unit is the basic organizational building block of the Army. A unit is generally identified with a single regimental or branch identity (though individual tradesmen of other branches are almost always present). A unit generally consists of 500 to 1000 soldiers commanded by a field grade officer.

Armour

A unit of armour is a Regiment, and is composed of subunits called Squadrons.

Artillery

A unit of artillery is called a Regiment, and is composed of subunits called Batteries.

Engineers

A unit of Engineers is called a Regiment, and is composed of subunits called Squadrons.

Medical

A medical unit is called a Field Ambulance.

Infantry

A unit of infantry is a Battalion, and is composed of subunits called Companies.

Service

Service units are called Service Battalions, and are not directly identified with a single branch or corps.