Dr. Manhattan was used as a weapon in Vietnam in Watchmen, which changed the course of the war.
David Brin's The Life-Eaters is premised on the idea that mass human sacrifice can create godlike beings, which the Nazis use to create Nordic gods to fight for them. Then other countries get in on the game, and things get pretty horrible.
"The Haunted Tank," a series running in DC Comics' G.I. Combat. During WWII Lt. Jeb Stuart is the head of a tank crew and the tank is haunted by his namesake, Confederate general J.E.B. Stuart.
The Malaysian animated film War Of The Worlds: Goliath combines the War of the Worlds with the World War I timeframe. Set in a 1914 after the initial Martian invasion and wherein mankind has tank tripods and technology reverse-engineered from Martian tech, the first world war threatens to break. However all that is put aside when the Martians attempt a second invasion. What was supposed to be World War I is turned into the second War of the Worlds, with the likes of Manfred von Richthofen the Red Baron and Theodore Roosevelt fighting together in a united special organization against Martians.
The Indiana Jones film series (particularly Raiders of the Lost Ark and The Last Crusade) revels in the idea that Hitler had a secret wing of his military searching for weapons of biblical proportions.
The Rocketeer - The US hasn't entered WWII yet, but the Nazis already plan on invading utilizing stolen jetpack designs invented by Howard Hughes.
In the short film 1945A, the Germans field a giant spider-like mech against the Allies, complete with a laser death ray.
In The Incredible Mr Limpet Mr. Limpet - a former human, now a fish - uses his "thrum" call to guide Allied subs to German subs in order to sink them. The Germans develop a special torpedo which homes in on thrums.
"The Fantastic World War II" includes stories by A.E. Van Vogt, C.M. Kornbluth, Lester Del Rey, and Harry Turtledove. Basically every story is an example of the genre of "weird WWII" in some way or another. It includes such stories about Sir Francis Drake participating in the Dunkirk evacuation, Count Dracula dining on Nazis, a Nazi teleportation device, and an entire army of cloned Hitlers.
Subverted in Harry Potter - Grindelwald played a big part in World War II. Had it not been for Dumbledore's intervention, perhaps it WOULD have changed history.
The non-fiction book My Tank Is Fight! by Zack Parson shows the various Real Life plans drawn up by both sides in WWII. Had any of these been built, they would have certainly qualified for this trope. Examples include the Nazi Landkreuzer P. 1000 Ratte, a super-large tank that would have been 35 feet long and over one thousand tons heavy, and the Allied aircraft carrier made of ice.
Two of the Elemental Masters novels (Phoenix and Ashes and Unnatural Issue) refer to magic being used by spies on both sides of World War I. The second also has a necromantic summoning in No Man's Land, which goes as well as you'd expect with all that raw material around.
In the Rivers of London series, WW2 had a distinct supernatural flavour in the background with the Germans doing all sorts of nasty things at Ettersberg (better known as Buchenwald concentration camp) involving death magic. The battle to shut down the Nazi's supernatural weapons at Ettersberg also destroyed the Allies magical corps too.
The Bartimaeus Trilogy indicates a few times that the American colonies, which never became independent in this setting, are gathering resources and wizards to fight a fantasy version of The American Revolution. This has the wizardly rulers of Britain very concerned.
Lammas Night, by Katherine Kurtz, follows the magical Battle of Britain that was fought alongside the publicly-known one, with archmage Adolf Hitler's Nazi coven fighting the witches and mystics of the British isles.
Appears in the backstory of Percy Jackson and the Olympians — apparently World War II was caused in part and fought largely by warring demigod children of Zeus, Poseidon and Hades. The effects were so devastating that they vowed never to have children after the war. Only Hades kept it.
In the sequel series, The Heroes of Olympus, the American Civil War was apparently caused by feuding Roman and Greek demigods.
Pinnacle Games published a Weird Wars line of d20 games taking place in Real Life past and future wars with supernatural additions. For example, Weird War II had the PCs playing Allied soldiers during World War II, but the Nazis had mutant soldiers, characters could use haunted vehicles and cast spells, and there were monsters. Lots of monsters. The Updated Re-release of the game line for Savage Worlds so far includes World War II ("Weird War II"), The Vietnam War ("Tour Of Darkness"), and theRomanEmpire and its campaigns of conquest ("Weird Wars Rome").
The GURPS "World War II" line included Weird War II. Want to use rune magic to send giant monsters against the alien supersoldiers working for the other side? It's in here. (note: Despite the name similarity, this isn't part of the Pinnacle series.)
After the Hellstorm in 1945, a number of real-world wars still went ahead with China facing stiff resistance from magic Tibetian monks in their invasion of 1950 and Iranian Revolution takes place while Shah is being treated for vampiric leukaemia in the United States in 1979. The supplement, "Funny New Guys" focuses on roleplaying the Vietnam War if it were fought using wizards and dragons.
The Command & Conquer: Red Alert Series deals with Albert Einstein developing a time machine during World War 2, finally finishing it in 1946 and killing Hitler in 1924, only to have World War II now involve America and her Allies (including Germany) fighting the Soviet Union and their allies.
Operation Darkness involves werewolves and firestarters, Jack the Ripper, and a descendant of the Van Helsing family working as Allied commandos versus Adolf Hitler's Nazi Germany. Hitler is an archmage and has allies including a vampire. Oh yeah, Hitler can also summon a dragon and skeleton warriors to even out the odds.
In Ring Of Red, Nazi Germany had been able to create Armored Fighting Walkers or AFWs in order to give the Wehrmacht a fighting edge against Allied troops. Due to the European terrain, they only saw limited service and instead, were used by North and South Japanese troops before and after the Japanese War when Japan was divided by the Allied Forces.
The Silent Storm series features the use of human-sized mecha called Panzerkliens, which were supplied by a terrorist group called Thor's Hammer to both Allied and Axis forces in order to reap off the profits while they waited for both factions to weaken each other off before they would start plans to take over the world.
In Call Of Cthulhu: The Wasted Land (set during World War One), you lead a small squad of British and American investigators in the Eastern French battlefield, attempting to stop the German to create an army of Undead and Eldritch Abominations. The game then received a prequel DLC campaign in which you play as Docktor [sic] Kaul, the Big Bad of the main campaign.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.