The regiment was deployed for counter insurgency operations during the 1971 Insurrection and in 1972, when Sri Lanka became a republic, the regiment changed its name to Sri Lanka Light Infantry. Since the early 1980s units of the regiment have been deployed to the northern parts of the island. After being deployed, a patrol from the 1st Battalion's 'C' Company – designated Four Four Bravo – was ambushed, marking the beginning of the Sri Lanka civil war. Since then the SLLI has been deployed on combat operations throughout the island and has expanded a total of 15 battalions.