During WW2, the American people had a lot of "drives" - scrap metal drives and knife drives among them. A LOT of metal objects and knives/swords/cleavers were donated to the government for military use. A lot of stuff that is deemed "rare" in some collector areas now-a-days is "rare" - metal toys, cookware, etc, simply BECAUSE people turned it in to be melted down for what ever was needed to fight the war.
Here is a picture from Life Magazine, February 1943, showing soldiers sorting through a load of knives donated for military use. In this one picture you can see hunting knives, kitchen knives, cleavers and swords.
Almost any hunting knife made from 1900 to 1941 could have become a "military knife" during WW2. Also, it was not uncommon for a soldier to have his family send him whatever hunting knife he had left at home when he enlisted. Crozier Technical High School in the Dallas area made over 1000 knives in its shop class before, during and after school, with help from local community members to be sent to Dallas/Ft Worth area men serving in the military.
San Antonio Iron Works, in San Antonio, Texas is somewhat famous/infamous for the thousands of swords they cut down during WW2 to make knives out of them. People donated family heirloom swords from the 1700s all the way up to WW1 swords and sword bayonets to be chopped down and re-ground.