WW II used the draft to get all the troops needed and that didn’t include women, gays or Guard. Right now the army seems like a gig to create Generals and recycle them into commentators. Eisenhower and MacArthur served for the duration. The WW II system worked just fine - declare a war, get overwhelming force with the help of Rosie the Riveter and win it.
If the Guard wasn't used, why is there a monument to them at Omaha Beach?