Marines are under the command of the Navy, if I understand correctly.

Wikipedia is your friend.

The Marine Corps has been part of the United States Department of the Navy since 30 June 1834 with its sister service, the United States Navy.[12] The USMC operates installations on land and aboard sea-going amphibious warfare ships around the world. Several of the Marines' tactical aviation squadrons, primarily Marine Fighter Attack squadrons, are embedded in Navy carrier air wings and operate from aircraft carriers.[13] These comprise the bulk of the US military's V/STOL aircraft, with 313 V-22 Ospreys, 183 F-35B Lightning IIs, and 78 AV-8B Harrier IIs as of 2025.[14]

https://en.wikipedia.org/wiki/United_States_Marine_Corps

USMC is part of the Navy.

The US Navy is sundowning the platform, and like most assets deemed too old for the Navy, is likely now being transferred to the Marine Corp. The command gaining the asset hasn’t had the time to repaint it yet or the don’t have the paint because Marines have an issue with eating art supplies.

https://www.ntv.co.jp/englishnews/articles/20217pzoyg6lod3s1ik9.html

The post is not captioned correctly. It is a US Navy aircraft. US Marine aviation typically sticks to Iwakuni and Okinawa, this post occured near Tokyo.