You should request his military personnel file! It's held by the National Archives, and can be requested using this form, known as the SF 180: https://www.archives.gov/files/research/order/standard-form-180.pdf That will tell you information like the date he enlisted, which other ships he served on, and what date he left the Navy.
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Good afternoon Ronald.
The first thing to do is request his service record. You start with the Standard Form 180, Request Pertaining to Military Records.
You can download the form here:
Fill it out as completely as possible. Enlistment/discharge dates and date of birth, etc. Mail or fax to the archives ( address to send to or number to fax to is included on the information sheet).
I attached an addendum sheet that included place of enlistment/discharge; known duty stations and dates (obtained from US Census forms); possible alternative spellings of names; any change in status such as getting married ( with spouse/children names), etc. By including this information now, you eliminate the need for the archives to contact you for additional information.
You can use familysearch.org (free) as well as Ancestry and Fold3 to search for information that could help find the records. I've requested three records and they were able to find all three of my WWI family members. I have two more to request.
By the way, my grandfather was on the Maine in 1907-1909 for the Great White Fleet Cruise.
I hope this is a help to you!