Five cannibals were employed by the Navy as translators during one of the island campaigns of World War II. When the Commanding Admiral of the task force welcomed the cannibals he said, "You're all part of our team now. We will compensate you well for your services, and you can eat any of the rations that the sailors are eating. So please do not indulge yourselves by eating a sailor."
The cannibals promised.
Four weeks later, the Admiral returned and said, "You're all working hard, and I'm very satisfied with every one of you. However, one of our chief petty officers has disappeared. Do any of you know what happened to him?"
The cannibals all shook their heads. After the Admiral left, the leader of the cannibals turned to the others and said, "Which of you idiots ate the Chief?"
A hand raised hesitantly, to which the leader of the cannibals replied, "You idiot! For four weeks we've been eating Ensigns, Lieutenants, Lieutenant Commanders, Commanders, and even one Captain, and no one noticed a thing. And then YOU had to go and eat a Chief!"