Here's a link to "The Fighting Lady: The Lady and the Sea", from which most if not all of this footage was cobbled.
www.youtube.com/watch
It's not rare in the sense that it's hard to find, as it was released by Twentieth Century Fox in 1945, but it's great stuff and well worth the look. See the whole hour long movie and you'll learn just about everything you need to know about USN uniforms in 1943- 1944.