One of the most famous images from World War II is Raising the Flag on Iwo Jima, by Joe Rosenthal. This pose has been copied for several comic covers along the way, and I'll add them as I run across them. But first, the original...
I probably need to go through the war comic titles, to find more of these images.
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Concise Listing:
Alphabetical:
(1/84) 2000 AD #351.
(12/99) 2000 AD #2,000.
(9/03) Action Comics #805.
(5/86) Adventures of the Outsiders #33.
(2/05) The Authority: Revolution #3.
(5/83) Blackhawk #258.
(12/16) Champions #1. (variant)
(1/08) Countdown to Final Crisis #15.
(1/11) Crossed Family Values #7. (and variant)
(9/94) Daredevil #332.
(2/13) Dark Avengers #184.
(11/07) Elephantmen: War Toys #1.
(2/16) Exmortis #4.
(7/94) Fighting American #6.
(1/11) Futurama Comics #53.
(6/13) Great Pacific #7.
(6/15) Hulk #14. (variant)
(1/14) Infinity #6.
(2/89) Invasion! #2.
(2/02) JSA #31.
(4/13) Justice League of America #1. (and 55 variants)
(11/13) Justice League of America: World's Most Dangerous TPB.
(5/02) Lady Death / Chastity / Bad Kitty: United.
(10/91) L.E.G.I.O.N. '91 #32.
(5/77) Logan's Run #5.
(8/12) Mars Attacks #3.
(6/50) Spectacular Features Magazine #2.
(11/04) Teen Titans #16.
(2/52) Thrilling Adventures In Stamps Comics #3.
(12/90) The Transformers #301.
(3/75) Unknown Worlds of Science Fiction #2.
(11/89) The War #2.
(8/97) Weird War Tales #3.
(6/09) Werewolves on the Moon: Versus Vampires #1.
(4/13) Justice League of America #1. There were 55 variants to this issue: 1 for each of the 50 States, 1 for Washington D.C. (District of Columbia), 1 for a combo pack with digital copy, and 3 different con versions. The combo pack and con versions were the US flag with other text printed on the cover. All can be seen in the comments, because I'm completist like that.