Crew cut haircuts were a necessity (often mandated by parents) years ago. It was to help keep you cool during the summer months while still looking stylish. Maintenance was almost zero. If you desired, you could spiff up the front with a little “butch wax” or other such ackapucky to make it stand straight up.
Today we have the buzz or the shaved cue-ball cranium. Don’t see many crew cuts these days. Maybe the older guys wear them but not so much the kids. I got a crew cut a few years ago and everyone at work saluted me and called me “sir” for two weeks. So I shaved my armpits. THAT was a mistake.
Here’s a great link to some famous crew cuts throughout history with a lot of photos so you can get an idea of what the crew cut was all about. One of these days, I’ll tell you about the “flat top with fenders” haircut. It was the mullet of the past.