Final answer:
The specific portal containing all OPNAV FOUO directives is not publicly listed due to their sensitive nature and is likely restricted to authorized personnel with proper clearance.
Step-by-step explanation:
The OPNAV FOUO directives, which are part of governmental records, may be found on a portal designed to house such documents. While the Freedom of Information Act (FOIA) website provides access to a wide range of government documents, directives specific to the Office of the Chief of Naval Operations (OPNAV) that are For Official Use Only (FOUO) may be located on a different, more secure platform meant for authorized personnel. The exact portal that contains OPNAV FOUO directives is typically restricted and would not be publicly accessible given the sensitive nature of FOUO materials. To access these directives, one would likely need credentials and clearance, and should consult the appropriate Department of the Navy or Department of Defense resources or contact authorities within the military chain of command for guidance on accessing these documents.