[YAMID] name of WW-II movie where... one of last US planes..

One of the last US planes in the Pacific is flying
to various outposts, and at one of them the Marine
commander (or Captain, whatever) tells them, as
they're about to leave, (more or less) "we all
realize we're only doing a holding action" (and
unspoken... it that it's a suicide detail).
Anyone recall?  Thanks
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