Daluwatte joined the Sri Lanka Army in 1961 as an officer cadet. On 1 May 1996, he was appointed as 13th Army Commander by former President Chandrika Kumaratunga.
As commander, Daluwatte lead Operation Riviresa against the LTTE during Eelam War III.
During his tenure in the Army he held important positions such as Chief Instructor of Officer Cadet School in ATC from 1979 to 1981, Commanding Officer, 1st Reconnaissance Regiment Sri Lanka Armoured Corps, Commanding Officer of Sri Lanka Army Service Corps, Coordinating Officer Commanding Troops in Mannar, Director-Supplies and Transport, Commandant of Army Training Centre and Military Secretary, Army Headquarters.
He was instrumental in establishing the Army Command and Staff College. After his retirement he was promoted to the rank of General and was appointed as the Head of the newly formed Joint Operations Command and later as the Chief of Defense Staff. (Colombo Gazette)