While serving as the Commander of the Sri Lankan Navy, Vice Admiral Thisara Samarasinghe was invited by the United States Navy Chief, Admiral Gary Roughead to participate at the 19th International Seapower Symposium conducted by the United States Navy at the Naval War College, Newport, Rhode Island, held from 6 to 9 October 2009.
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Thereafter he served on board Fast Gun Boats of the 3rd Fast Gun Boats Squadron and the Surveillance Command Tender and Surveillance Command Ship (then the Flagship) of the 7th Surveillance Command Squadron.
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His thesis was on “Strategy to Defeat Maritime Terrorism” and he wrote the seminar paper on Indo - Sri Lanka “Sustainable Cooperative Security Challenges and Options” at National Maritime Foundation.
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He also won the Best Commander’s Prize in 1972 receiving the award from Prime Minister Sirimavo Bandaranaike.