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Dear Mr. Johnson,
Thank you for posting your request on History Hub!
Thus an explanation according to our Navy experts: if the veteran joined the Navy (Regular), they are obligated to served four years of active duty. If the veteran decided to join the Naval Reserve, they are obligated to serve six years with 2 years as active duty and four years on ready reserve to be called up. During World War II, the Naval Reserves were called up, hence why they looked like they were on active duty. When they separated from the Navy after the war, they went back to reserve status.
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