The red-headed royal wrote a birthday note from Afghanistan to the daughter of a comrade-in-arms.
Image may be NSFW.
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Via: @Swagitos
For comparison, here's a letter that Prince Harry wrote to Mayor Ron Henry of Gila Bend, AZ in 2011:
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.