If PO3 wants to transfer to shore duty in San Diego, what duty type will he be assigned?

When a Petty Officer Third Class (PO3) requests to transfer to shore duty in San Diego, the appropriate assignment type is shore duty. Shore duty is specifically designated for service members who are assigned to positions on land rather than on ships or at sea. It comprises various responsibilities that offer stability and allow for a more predictable lifestyle compared to sea duty.

This option is correct because shore duty assignments can include various roles, such as administrative positions, training commands, or support functions, which all occur within a land-based environment. In contrast, fleet duty typically involves operational roles at sea and in the larger naval fleet, while sea duty directly involves assignments aboard ships. Temporary duty may refer to short-term assignments that can occur either on land or sea but do not represent a permanent change in assignment type. Given that the context of the question specifies a desire for a position specifically based in San Diego, which is a known location for shore duty assignments, choosing shore duty aligns perfectly with the request made by the PO3.