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I'm sure that this man will be identified. He's in the Army---probably wearing dogtags, has his wallet on him and likely has his name stenciled on his clothes. Could even have his logbook with him.
Possibly survived a crash and was trying to walk out. Maybe fell into a crevasse or just plain froze to death or maybe expired after a while from injuries. If he was killed in a crash outright and body expelled then there ought to be an airplane in the general vicinity.
They probably flew into the side of Mendel and tumbled to the glacier below.This is VERY steep terrain. As for crevasses, they are probably not an issue as the Mendel glacier is very small.