What year did Ft Pierce close to UDT training?

From January 1943 to February 1946, more than 3,600 young American volunteers trained in Fort Pierce as members of Naval Combat Demolition Units and Underwater Demolition Teams.

I believe somewhere around 1946. I'm sure you could get a definitive answer at the museum.

Sorry, I am not able to answer your question!(I don't know too much about the American history )

There is tons of info and history there. You also get to move about at your own pace.