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In page Salute:

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Some "creative" salutes are in use in certain mounted (cavalry) units. The fingers can be spread out with only the right thumb brushing the temple, or the hand can be cocked vertically along the cheek, with the little finger detached or not. These unusual regimental salutes are mannerisms which are lost during official ceremonies. A civilian (even if he has a hat) never salutes, but a nod to a patrolling soldier is generally appreciated.[citation needed]