Here's a very nice cacheted cover for the U.S. Navy destroyer USS Beale. As far as I know, it doesn't commemorate any specific event.
Postmarked: HC - U. S. S. BEALE (DD-471) - December 21, 1967
Cachet: Black rubber-stamped design featuring a globe and anchor, with text reading "UNITED STATES NAVY / WORLD SYMBOL / of / STRENGTH and FREEDOM".
Condition: Clean and neatly label addressed.
MULTIPLE ITEM SHIPPING DISCOUNT: I will ship up to 4 covers for the single base shipping charge shown. For purchases of more than 4 covers, the shipping charge will increase by just a small increment for every 4 additional covers.