When does my Premium Silver membership end?

Once the official expiration date (March 31) for your Premium silver membership arrives, you can:

Change from PREMIUM SILVER to PREMIUM membership: If you did not once again meet the requirements to qualify for Premium Silver membership during that calendar year.
Remain a PREMIUM SILVER member: If you once again met the requirements to qualify for Premium Silver membership during that calendar year.
Become a COMODORO (COMMODORE) member: If you met the requirements to qualify for this membership rank during that calendar year.