Morris, Rudi, Ivan, and Beck are best friends for life. So when one of them is drafted into the Vietnam War, the others sign up, too - each with a different branch of the US military.
Morris joins the US Navy, and he makes it his personal mission to watch over his friends from the USS Boston. But the Boston itself isn't safe from attack. And although Morris means to keep his friends safe, he may have his hands full just watching out for himself.