Final answer:
A PO3 transferring to shore duty in San Diego will receive a shore duty assignment, which entails a position based on land rather than at sea, at one of the various naval facilities in San Diego.
Step-by-step explanation:
If a PO3 (Petty Officer Third Class) is requesting a transfer to shore duty in San Diego, they will be assigned a duty type that is generally referred to as shore duty. Shore duty assignments refer to positions within the United States Navy that are based on land, as opposed to sea duty, which involves being stationed on a vessel.
The exact nature of the shore duty assignment in San Diego can vary widely, as San Diego is home to a broad array of naval facilities and commands, including Naval Base San Diego, Naval Medical Center San Diego, and various other support and administrative units.