I remember discussing this with the late John Gerstner some years ago. He said that we have an obligation to tell the truth to those who have a right to it. The murderous Nazis would have no right to the truth since their intent is to use it to a wicked purpose.

He also cited examples where we intentionally deceive persons and think nothing of it. For example, a football team is under no obligation to tell the defense that the play going to the right is really a reverse coming back to the left.

We are under no obligations during times of war to be truthful to the enemy. They have no right to our truth. Deceit is expected under certain circumstances.

For what it's worth...

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Dr. Don Kistler