I'll be be writing a report on the status of the U.S. Navy soon for this TL. It will take an insane amount of research to know where the ships were at the time of the POD. This will only cover the combatant assets (emphasis on the carriers, destroyers, cruisers, and submarines) and some auxiliaries such as the USNS Mercy and USNS Comfort hospital ships. My initial research shows the USS Ronald Reagan (CVN-76) after five-month post-shakedown availability, received her second flight deck certification which encompassed all flight operations, including aircraft launch and recovery, safety, crash and salvage, fuel certifications, and training on May 8, 2004 (The exact date of the POD). The Gipper would depart Naval Statin Norfolk on May 27, 2004 towards the Straits of Magellan at the tip of South America on the way to San Diego. Hence in this timeline, it would be stuck at Norfolk, never seeing action as the city was overrun with RLFs. The USS Nimitz (CVN-68) would was completing a planned incremental availability at NAS North Island from February 23-August 22, 2004 (OTL), therefore would be at San Diego by the time of the outbreak. It would most likely been abandoned at port while the city was overrun.