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Dear Mr. Moore,
Thank you for posting your request to History Hub!
The National Personnel Records Center, St. Louis can provide you with a verification form detailing your official sea service depending on your years of service. Please fill out the SF-180https://www.archives.gov/files/research/order/standard-form-180.pdfand use page three to determine where to send your request. Please note that you are seeking verification of sea service time.
We hope this information is helpful. Best of luck with your endeavor!
It's on your DD-214, box 12 there is a section for years and month of sea service!