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