Could it be ?

[Capt Chuck]

I didn't know the SeaCrafts that Carl built were in Vietnam. I thought they were built for the Bay of Pigs. The variable deadline could take the 90 mile crossing to Havanna.
I understood they were constructed with a steel forward step-up platform mounted with a 50cal. or 60 cal. Machine Gun. I was Navy in Vietnam for 3 combat campaigns and don't recall a SeaCraft type hull. I did see two PGH (Patrol Gunboat Hydrofoil) picture below I took Aug '69 outside
Danang Harbor. USS Tucumcari PGH2. They could not take the rough water & constant repairs but with Shark Teeth painted on the stem, they were badass skimming the rice paddies!