JACKSONVILLE BEACH, Fla. – A ceremony held Sunday in Jacksonville Beach was symbolic of the ultimate sacrifice for freedom that 19 World War II merchant marines made in 1942. Right off the coast, the American oil tanker SS Gulfamerica was sunk by a Nazi submarine 80 years ago. “That one saved a lot of others in the future because we could learn from that,” said Charlie Sellers, a retired merchant marine. MORE FROM FLORIDA TIMES-UNION: U-boat captain sank oil tanker off Jacksonville Beach Sellers is 91 years old and served as the chief engineer for the merchant marines for 45...