The War in the Pacific. Strategy and Command. The First Two Years (US Army Green Book)

Narrative, Kindle version of the US Army Green Book series. Extensive, detailed and authorative there are no more comprehensive accounts of World War II, unless perhaps it is the very similar British HMSO Official histories.
The many maps, table and diagrams of the original have been removed to make a portable 'pocket' version for reading on the plane or train.
The complete version is available in PDF from the US Army Historical Center.