Earlier, he served as Deputy Chief of Staff of Sri Lanka Army (DCOS).

[1] Prior to join DCOS, he served as the Commandant of Sri Lanka Army Volunteer Force[2] and before this appointment he had served as Commander, Security Forces - East and General Officer Commanding(GOC), 22 Infantry Division.

[3] After completed Higher Secondary education at Mahanama College, Colombo he joined Sri Lanka Army as an officer cadet on 27 October 1986 to the Intake 26 and was commissioned as a Second Lieutenant into the 1st Battalion of the Sri Lanka Light Infantry on 23 July 1987.

Being the officer of Sri Lanka infantry he successfully commanded 4th Battalion of Sri Lanka Light Infantry Regiment which was always on front line combat during Sri Lankan civil war.

[4] Weerasuriya is also the Colonel of the Regiment of Sri Lanka Light Infantry.