What information is included on a war memorial?

Each war memorial can take a different approach so there is no standard amount or pattern of information. Some memorials represent a collective and do not list individuals, e.g. The Cenotaph. Others may provide a list with minimal information, e.g. Rank, Initials, Surname. Some include many more details, including a full name, service number and unit and whether they died or served and returned.
Commonwealth War Graves Commission memorials exist in order to officially record the names of dead who have no known grave or those buried or lost at sea and so always record names and units. Some display dates of death but this depends on the design of the individual memorial.