Regular forces later called Niomita Bahini ( regular forces) cosisted of the members of the of the East Bengal Regiments (EBR), East Pakistan Rifles later (EPR later BDR), police , other paramilitary forces and the general people who were commanded by the army commanders in the 11 sectors all over Bangladesh. Three major zones ; Z-force under the command of Major (later Major General) Ziaur Rahman, K-force under Major (later Brigadier) Khaled Mosharraf and S-force under Major (later Major General) K.M.Safiullah were raised afterwrds to fight battles in efficient manners. Irregular forces are Generally called Gono Bahini (peoples army) werethose who were trained more in Gerrilla warfare than in regular one.
After sometime Pakistani Army causing heavy damages and casualities and prompted to induct Razakars, Al-badrs and Al-sams (mostly members of jamaat-e-Islami and and other islamist groups), also some Biharis who settled in Bengal.
Later Navy, Airforce and other independent forces were included in bangladesh army.
They had also swadhin bangla Betar Kendra for broadcasting.