* Early Appearances: Wolverine's earliest appearances in the comics (1974) placed him in World War II, fighting alongside Captain America in the Canadian military. He was depicted as a savage berserker, with a mysterious past.
* Weapon X Program: Later, it was revealed that Wolverine's memories were fragmented due to his Weapon X program experiments. These experiments gave him his adamantium claws and healing factor, but also wiped out large chunks of his memories.
* Lost Years: While Wolverine's memories were hazy, he was confirmed to have served in the Canadian military during World War II. His time in the war, while significant, became a bit of a mystery as the exact details and missions were unclear.
* The Untold Story: In 1989, Wolverine's origin story was expanded, revealing him as a feral creature known as "Logan" before his Weapon X experience. This period placed him in the 19th century and further complicated his World War II memories.
* Modern Interpretation: Modern comics have focused on the idea that Wolverine's memories of World War II are fragmented and unreliable. He may have fought in the war, but the exact details of his experiences are likely a mix of fact and delusion, influenced by his trauma and experimentation.
In summary, Wolverine's World War II service is confirmed, but the specifics of his experiences are hazy and disputed. It's an ongoing storyline in the Marvel Universe, with interpretations evolving over time.