Here's my "U" listing for April's A-Z Challenge! And the theme is, "Golden Age Comic Book Characters with the Same Name As Modern-Day Characters."
The Unknown Soldier first showed up in Our Flag Comics #1, 1941. He had no alter ego, but could fly, had super-strength, and he carried a "nitro gun" which fired explosive bullets.
DC's Unknown Soldier was introduced in Star-Spangled War Stories #151, published in 1970. He was a facially-disfigured master of disguise.
Thanks for your time.