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.
US Marines .
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I'm not in a position to answer, but do you mean Army, military, or marines?
US Marines prevailed over the Japanese .
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.
The United States Marine Corps primarily used the M1 Garand as their standard issue rifle during World War II and into the Korean War. The M1 Garand is a semi-automatic rifle known for its reliability and accuracy. Later, the Marines transitioned to the M16 rifle, which became the standard issue in the 1960s.
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no immediate threat is present
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