When I went through Army Basic at Fort Ord, in 1969 it was mostly old fashioned DIs yelling, threatening, etc.
By chance, my platoon DI was a Vietnam vet SFC who took a quiet approach. He was a Native American.
He said he would treat us like men, unless we screwed up. Well of course eventually we screwed up, so we got the punishment--a night of scrubbing and polishing the barracks.
But even then, he was low key and quiet. We did just as well as the other platoons with scores.
Most were headed to Vietnam, and took training pretty seriously. Most were draftees. I don't buy the idea that draftees won't be good soldiers; born out by WWII, Korea and Vietnam.