I’ve heard of steel beach picnics, but maybe this is more of an aluminum beach event.
Official caption: “Cam Ranh Bay, Republic of Vietnam. Engineman Second Class D.W. Kirkpatrick barbecues some chicken (could be pizza) on a charcoal grill on the fantail of U.S. Navy Fast Coastal Patrol Craft (PCF 68) during a run on Cam Ranh Bay, July 1968.”
NARA Photo: 428-GX-K54697
Of the 193 PCFs fielded during the Vietnam era, two are preserved in the U.S., in a salute to the famed Brown Water Navy of that conflict.
Also, a few Swift boats are still in operation, in Southeast Asia.
