Wolverine returned to civilization sometime in his early years, after leaving Rose and the Hewletts behind. He worked as an Allied agent during the Second World War, fighting the Nazis in Madripoor and Europe during World War II and encountering both Captain America and the youthful Natasha Romanova (Black Widow), as well as possibly being part of the Devil's Brigade. Afterward, he joined the Canadian Army and participated in D-Day, as well as the liberation of the Netherlands. He may have also been a spy for the Allied Forces and it was recently revealed that he may have spent time in the Sobibor concentration camp. 

 

He apparently encountered the adventurer Puck some time in the 1930's. He also spent some time in Japan, where he trained with the ninja Ogun. Wolverine had strong memories of loving the Native American woman, Silver Fox, and living with her in a cabin before they were recruited into Team X, but whether or not these memories were true would haunt him for a long time before he finally learned the truth. 

 

Sometime after World War II, Logan was taken by a group of scientists led by Dr. Cornelius as part of the Weapon X Project. Cornelius was hired to perfect and use a technique that would bond the indestructible element adamantium to human bone cells. Logan's skeleton was bonded to the adamantium, and he was indoctrinated into the Weapon X assassin program.

 

Years later, Logan resurfaced as a federal agent. During the 1960s, he was placed on a government Black Ops team with Sabretooth, Maverick, Kestrel, Mastodon, and Silver Fox. Team X was apparently disbanded after a botched mission concerning Omega Red. On his birthday, Sabretooth, who lived in the same town that Wolverine lived in, apparently killed Silver Fox.