I am a long way from what might be described as well-informed, Ron, but to the best of my knowledge there is no "easy look-up" for Navy personnel. My limited experience indicates significant differences between what is available for Army and for Navy. For instance, the National Archives have a WWII enlistment database accessible online, but no Navy database. In addition, their WWII casualty database for Army personnel includes serial numbers, while the Navy database does not. I can shed no light on why these differences exist. Maybe the Army just had better bean counters?