Daluwatte was born in Ambalangoda, a coastal town in the south of Sri Lanka, to D. H. Paulis De Silva, a planter and former athlete; and D. W. Leela Somawathie. He has one sister, Malini and four brothers, Susantha, Pinsiri, Rupasiri and Dhanasiri. He received his education in Dharmapala Vidyalaya and at Ananda College. During his school career captained the Ananda College badminton team from 1957 to 1960, was a member of the college tennis team in 1959 and 1960 and he was the wicket-keeper in the Ananda first XI in 1960. He was a college prefect and a Lance Corporal of the cadet platoon.
In 1995 Major General Daluwatte, who was the Chief of Staff of the Army was appointed as Overall Operations Commander - North and East by President Chandrika Kumaratunga to command Operation Riviresa the largest combined military operation undertaken by the Sri Lankan armed forces at the time. With the objective of re-gaining control of the Jaffna peninsula from the LTTE, Operation Riviresa was successful in re-capturing Jaffna and pushing the LTTE to the jungles of Wanni with significant loss of men and martial.
Commander of the Army
On 1 May 1996, he was appointed as the 14th Commander of the Army of Sri Lanka by President Chandrika Kumaratunga and promoted to the rank of Lieutenant General.The early part of his tenure saw the loss of Mullaitivu and Operation Sath Jaya which captured Kilinochchi. After the loss of Vavunathivu, Operation Jayasikurui was launched as the largest military operation undertaken by the Sri Lankan armed forces at the time to open a land route to the Jaffna peninsula through the LTTE held areas. It was called of by President Kumaratunga after having captured Mannakulam, Omanthai and Nedunkerni, but losing Kilinochchi and failing in achieving its objective. In April 1997, he co-hosted with Commander Pacific Army the Pacific Armies Management Seminar. On 15 December 1998, he retired from the military service, having been promoted to the rank of General.
After his retirement, he was appointed as Chairman of the newly created Joint Operations Bureau, however he was reinstated to active service with the formation of the post of Chief of Defence Staff. During his tenure, he was given authority over all Sri Lankan armed forces to coordinated efforts to stall the LTTE offensive on the Jaffna peninsula following the loss of Elephant Pass. This was achieved with the establishment of the Muhamalai and Nagarkovil defensive lines which remained in place till the last days of the conflict in 2209. He retired as CDS in 2002. Daluwatte offered his resignation in September 2002 following casualties suffered by Sri Lankan security forces in an offensive.
Later life
After retiring from the army, he was appointed as the Ambassador of Sri Lanka to Brazil in 2002. With no permanent diplomatic presence in Brazil, General Daluwatte established a Sri Lankan embassy in Brasília and served as Sri Lanka Ambassador till 2005. Later, he was appointed Chairman of the Gem and Jewellery Authority of Sri Lanka and then the Chairman of the Civil Aviation Authority of Sri Lanka. He also served as the Chancellor of the Kotalawala Defence University.
Death
General Daluwatte died on the 27 August 2018 at the army hospital in Colombo, Sri Lanka. He was cremated at the Borella Cemetery in Colombo with full military honours on 29 August 2018.
Family
He met his wife while he was captain of the national basketball team whilst she was playing for the Sri Lanka national women's team. They had a daughter Radiesha; and a son, Radesh.
Sri Lankan newspaper The Sunday Leader alleged in January 2011 that Daluwatte wrote his own recommendation for the Weera Wickrama Vibhushanaya, which is Sri Lanka's second highest gallantry award for actions in combat. The newspaper also alleged that he did not obtain three eye witness reports which is a usual requirement for the medal. The citation stated that the medal was for gallantry in the operation to capture Jaffna. Daluwatte later stated that he had not been in combat at Jaffna but saw action at Neerveli, though none of the commanders spoken to by the newspaper could verify this.