Harry S Truman's claim that the USMC had a "propaganda machine that was almost equal to Stalin's" was not completely without merit.
Something that really shocks me about history is the Army history of beach landings, from the historical past like the Mexican/American war, to the largest, to the most of history and WWII, the Army totally dominates those.
I thi9nk you are mistaken it was the MacArthur comand that had its own publicity department—if corespondents did not tow the line then then did not get the juicy details. It was a machine indeed.
Whereas the Navy and Marines had to be convinced to report successes as well as failures.
I learned of all this through the magnificient audio book trilogy by Ian Toll -—its a big beefy 100 some hours of facts, stories and descriptions that will give one a complete understanding of the Pacific War from Pearl Harbor to V-J Day. It also comes at a price tag too....but indulge and enjoy.