Many of the men who fought WWII volunteered.
Now ... EVERY Soldier, Sailor, Airman or Marine who joined in the 1980s up to the present day, is a 100% volunteer, several times over.
The actual situation is that the Vietnam era Army was 75% volunteers, while the Army that fought in WWII was 93% draftees, and all branches of the military drafted in WWII, including the Navy, during Vietnam only the Marines and Army drafted.
About 70% of the war dead in WWII were draftees, about 70% of the Vietnam war dead were volunteers.
Today’s tiny military has had to desperately seek females and pay out billions, to make up for the dismal enlistment enthusiasm, at one point during our current wars, the U.S. Army was accepting 42 year old women.