The Territorial Army initially had various types of units such as Armed Regt (TA), Infantry Battalion (TA), Air Defence (TA), Med Regt (TA), Engineers Field Park Coy (TA), Signal Regiment (TA), EME Workshop (TA), Coast Battery (TA), ASC GT Coy (TA), ASC Compo Platoon (TA), AMC Field Ambulance (TA), by 1972 these units have either been disbanded or converted to Regular Army except Inf Bn (TA).
The Territorial Army is a part of Regular Army and its present role is to relieve the Regular Army from static duties and assist civil administration in dealing with natural calamities and maintenance of essential services in situations where life of the communities is affected or the security of the Country is threatened and to provide units for Regular Army as and when required.
Presently the Territorial Army has a strength approx. 40000 persons comprising of Departmental TA units such as Railway, IOC, ONGC, and Non Departmental TA units of Infantry Battalion (TA) including Home & Hearth Battalions, Ecological Battalion (TA) affiliated to various Infantry Regiments and Engineer Regiment (TA) for maintenance of Line of Control Fencing.