[little jeremiah]

http://www.freerepublic.com/focus/chat/3707708/posts?page=1832#1832

Official statement. No Marine reps.

[Gulf War One]

Same Department. Both the US Navy & the US Marines BOTH use the same NCIS.

[reed13k]

NCIS covers both Navy and Marines - because the Marines are part of the Department of the Navy and fall under the Secretary of the Navy.