One in particular comes to mind of Oswald Boelcke, commander of Germany's Jasta 2 (and who was primarily responsible for starting Baron Manfred von Richthofen, aka the Red Baron, off on his distinguished but very brief career). This haunting photo shows a very young Boelcke (he was killed in a mid-air battle collision when he was only 21 or 22), so very very handsome, and so heartbreakingly young ... but with a depth of age, wisdom, ANYTHING but youth and adolescence, in his eyes and face. I have seen literally dozens of photos of these young flyers, and while many of them are handsome, not a single one is a "pretty boy."
Unfortunately, a lot of American movies these days are populated by "pretty boys".
"Seeing the elephant," even from the air, does that to a young man. Pictures of Civil War soldiers, no matter how young, have that same "no more surprises" look.