Service in the Merchant Marine means saying goodbye -- keep the home fires burning. It is "loose lips sink ships," a convoy tiptoeing through a dead-thick fog. It is the ear splitting clatter of ack-acks and cries of "aircraft sighted, all hands." It is fear, bravery and just doing a job. It is the lifeblood of democracy's arsenal. This World War II salute to Allied forces that supply the war effort sweeps you into the action-filled voyage of a besieged freighter. Humphrey Bogart, a World War I seaman and an avid recreational sailor, stars as First Officer Joe Rossi, who, along with his captain (Raymond Massey), matches tactics with U-boats and the Luftwaffe. The tactics are on target -- so much that this became a Merchant Marine training film.