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Rear Admiral (RADM) (Two-Star) Sean Wat, a Naval Officer by training, was enlisted into the Singapore Armed Forces (SAF) in January 2002. He was awarded the Singapore Armed Forces Overseas Scholarship, and graduated from Stanford University in 2006 with a Bachelor of Arts and Science (Mathematics and Philosophy) and a Master of Science (Management Science and Engineering). He also attended the United States Naval Command and Staff Course, conducted at the United States Naval War College in Newport, Rhode Island from 2013-2014, and earned a Master of Business Administration from the Massachusetts Institute of Technology in 2019.

RADM Wat spent his formative years in the Republic of Singapore Navy (RSN) aboard the Victory-class missile corvettes and thereafter the Formidable-class frigates. He assumed command of the frigate RSS Supreme from 2014 to 2016, and led the ship to clinch the Squadron "Best Ship" and "Top Gun" awards. RADM Wat also served as Deputy Commander Maritime Security Task Force / Maritime Security Command from 2019 to 2020, and as Fleet Commander from 2022 to 2023.

Ashore, RADM Wat was Director of the Defence Policy Office at the Ministry of Defence (MINDEF) from 2021 to 2022. In this role, he oversaw the foreign interactions and defence policy of MINDEF and the SAF. RADM Wat also served as Head, Force Transformation Office, Joint Plans and Transformation Department, between 2016 and 2018, where he was responsible for long-term planning and capability development efforts for the SAF.

RADM Wat is happily married to Chen Jia'en and they have two children.