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).
The Marine Corps maintains multiple bases in Okinawa including Camp Foster, Camp Hanson, Camp Schwab, and Marine Corps Air Station Futenma, but all the Okinawa bases are grouped together as Marine Corps Base Camp Smedley Butler
the US. brig Niagara is Pennsylvania's state ship
The Navy and Marine Corp refer to their jail as "brig" whereas the Army refers to jail as "stockade"
After the battle of Okinawa, 31 was left
is there a military cemetery in okinawa
That Marine is in the brig or MAI
Probably the 31st Marine Expeditionary Unit (MEU) since it's the closest by being stationed at Camp Hansen, Marine Corps Base Camp Smedley D. Butler, Okinawa, Japan .
US Marines were engaged in "Island Hopping" campaigns against the Japanese . For example , Guadacanal , Tarawa , Peleliu , Iwo Jima and Okinawa .
(2ndMarDIV) Camp Lejeune, North Carolina, (1stMarDIV) Camp Pendleton, California and (3rdMarDIV) Camp Butler, Okinawa Japan are the three main bases for the Marine Corps. There are various smaller camps throughout the US.
US won the "Battle of Okinawa". which lasted from April-June in 1945
US Marine Eugene Sledge ( born in Mobile, Alabama ) who wrote about his WW2 experiences in his book "With the Old Breed: At Peleliu and Okinawa" and Holland Smith ( born in Russell County, Alabama) , another US Marine , who is renown as the 'Father of Modern Amphibious Warfare' .