Well, my husband drank beer and played video games while doing one of the hardest programs in the Navy and graduated first in his class. His friends hated him for it, since he'd be calling out answers to them as they studied while he just played games the whole time.
He is getting good grades in his upper level college classes, too, now, even with watching the baby and playing the video games.
Is he a Nuke?
This is pretty much my experience when I was in the service. I had 100% in most of my schools as did my dad.