General Chandrasiri is a graduate of the Defence Services Command And Staff College, Mirpur and National Defence College, India.
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In the final stages of the Sri Lankan Civil War he was appointed Commander Security Forces Headquarters - Jaffna, during which his command resisted several attacks on the Jaffna peninsula by the LTTE until a successful offensive by his divisions pushed the LTTE out of the Jaffna peninsula and recaptured the statistic Elephant Pass.