"my one question on a modelling point would be were all the vehicles the marines used in the pacific that shade of green? or is this another error on the part of the production team?"
I went to the Pacific Campaign site. Marine Green is not OD Green - but closer to Forest Green. There is a rather long description of how the Marines acquired vehicles, etc. The tanks were US Army issued and painted OD. The LVT's were US Navy and started as a blue/gray and later painted green or Camo. If you notice in The Pacific - trucks, half-tracks, jeeps were painted this Forest Green.
Cannot judge the accuracy of the ships since most Navy ships are LGS's to me - Large Gray Ships.
Tarawa - although a significant battle in the Pacific was not covered since none of the main characters went to Tarawa. Iwo Jima battle scenes lasted as long as john Basilone did. Again this is not a history of the war in the Pacific it is about a few of the men who fought in the Pacific.
I too would have liked some more voice over to explain what is going on. If you were not up on the Pacific or read Hugh Ambrose's book, The Pacific - it could be confusing. On the Iwo episode - Tom Hanks in a voice over states that at Iwo the Marines suffered more casualities than did the Japanese. 23,000 Marine casualities to 22,000 Japanese. What Tom didn't say was the total deaths at Iwo were about 7,000 KIA and 16,000 WIA to 22,000 KIA for the empire. Although what he said is techincally correct - it could give a viewer the wrong impression -
Tha battle sequences are not "staged" in my mind. Not clinical. I felt for those Marines trying to take this islands from the Japanese. The "slaughter" at Peleieu and Iwo were just that, slaughter. Marines drove head on into fortified Japanese positions and paid a hevy price to wrestle these islands away from a determned and skilled enemy.
Even with its "warts" I believe The Pacific is a noble effort that shows us the war on the other side of the globe was just as important.