"Dan," whispered Dave Darrin, Ensign, United States Navy, to his chum and brother officer, "do you see that fellow with the green Alpine hat and the green vest?" "Yes," nodded Dan Dalzell. "Watch him." "Why?" "He's a powerful brute, and it looks as though he's spoiling for a fight." "You are not going to oblige him, are you?" asked Dalzell in a whisper, betraying surprise.