Okinawa was an Army campaign, under General Simon B. Buckner Jr., commander of the US Army's 10th Army. Iwo Jima was a Marine Corps campaign. However, Marines did fight on Okinawa; see the website "Battle of Okinawa", then look at the referrences at the bottom of the article for research material on the US Marines (at Okinawa).
It depends on the number of Marines. The rifle belonging to a Marine would the Marine's rifle. If you are talking about multiple Marines it would be Semper Fi is the Marines' unofficial motto.
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US Marines .
US Marines prevailed over the Japanese .
I'm not in a position to answer, but do you mean Army, military, or marines?
Iwo Jima & Okinawa were both major battles where the Japanese fought US Marines in WW2 .
In terms of number of ships , the Okinawa invasion fleet was larger. In terms of casualties the number was far greater at Okinawa. The US Navy deaths were higher than Marines or Army.
no immediate threat is present
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the m14 came into use just before the Vietnam war but scince it was heavy and the recoil was bad in full automatic it quickly was replaced by the M16 but still used it as a sniper rifle and marines today are dusting off old m14s and using them as sniper rifles
The 1st Marine Division took part in four campaigns in WWII. Guadalcanal, Cape Gloucester, Peleliu and Okinawa. Individual Marines were often rotated home after three campaigns, so only a small percentage of personnel were in all of them. There was little fighting on Cape Gloucester, but it was very miserable. It rained continuously, and more Marines were killed by trees falling than by the enemy. Peleliu and Okinawa were as bad as any campaigns the Marines were involved in during the war. By the time of Okinawa there were six divisions of Marines, and three of them were on Okinawa (1st, 5th and 6th) while the 2nd, 3rd and 4th Divisions were on Iwo Jima. Iwo Jima was an all Marine operation though. Okinawa was big enough that it was the only place outside the Philippines in the Pacific where the US deployed an entire field army, with the rest of the US 10th Army troops being US Army soldiers. Okinawa was the prewar home of the Japanese Artillery School, and they had every inch of it registered for fire. There were places where your life expectancy was measured in seconds.