Let me confuse things even more:
The western half of the island of New Guinea has been known as the "Province of Papua, Indonesia" since about 2003. Now I know that some folks don't like Wiki, but you can check elsewhere. As far as I know, the name was changed. See the link:
http://en.wikipedia.org/wiki/Papua_(province)
http://en.wikipedia.org/wiki/Papua_(province)
So what we all thought was Irian Jaya, is now the "Province of Papua", Indonesia. This was pointed out recently in a book published in 2006 titled "The Ghost Mountain Boys" which treats the battles in New Guinea during WWII; the author notes these distinctions to try to avoid the confusion of the name changes.
Before it was known as Irian Jaya or Province of Papua, the western half of New Guinea was known as Dutch New Guinea. That much is pretty well known by some of us older people on the forum.
The southern half of the eastern half of the island of New Guinea was known as the "Territory of Papua". This is the Papua that many of us are familiar with. This territory includes the strategic city of Port Moresby. The "Territory of Papua" was under the control of Australia for many years. It is now an independent country.
At the time of WWII, the island of New Guinea was divided in to three distinct territories:
Papua New Guinea (the southern half of the eastern half of the island).
Northeast New Guinea (the northern half of the eastern half of the island).
Dutch New Guinea (the western half of the island of New Guinea).
Like I said, you don't have to believe me--just do a quick web search of the two terms:
Territory of Papua
and
Province of Papua
TonyM.
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Read twice, check map!!! 
Quite right, whole different set of difficulties there!
?? he went up on an aerial recon flight on a stinon l-5 or piper cub. he was strafed & bombed countless times from new guinea, to morotai, to mindanoa. "harrassing piss call charlie" flights bombing his unit frequently some nights. he mentioned aussie ace killer caldwell & said he was in a p-61. i know that's not true, but chalk it up to ww 2 grunt gossip. my brother rescued a piece of aluminum shrapnel from a japanese aircraft for me as my dad thought it was junk. it's roughly 4x4 inches.