Speaking of signaling SAR aircraft...
How common do you think it is that the pilot can read the International Ground-Air signals, understand Morse code, or understand the significance of three (three signal fires, three signal flashes, etc)?

FM 31-70, appendix B, figure B-1

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Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane