The PT boats seen at the beginning (and for a brief moment, at the end) of the film are Elco 77-foot PTs, the type of boat that saw intense combat against the Japanese Navy's "Tokyo Express" in the Guadalcanal area early in World War II. The wartime second-series Elco 77-footers, which were the same type as PT 59, John F. Kennedy's second command after PT 109 was rammed and sunk, are seldom seen on film, and hardly ever in color.