if I did not turn in my dd214 when I applied for ss how does the ss admin know how much time I spent in the service

Hi,

Starting in 1968, Social Security upgrading their computer system to identify active duty military wages and automatically apply the appropriate additional deemed military wages to the Social Security earnings records of those individuals. Therefore, you would only need to submit proof of your military service dates if you had any active duty prior to 1968.

Best, Jerry