What is one thing that your Drill Sergeants or Drill Instructors taught you that you will never forget?

"Lieutenant, there are 24 hours in a day, and if that is not enough time to get it done, we can always do it at night!!"

We just got back from Field Week, having eaten a bunch of MREs. SDI marched us to the parade deck to give us a refresher course, and holy mother of God, the gas being passed. My prac hat's words still ring every so often when I'm in formation.
"Stop fucking farting!"

Always have a clipboard with a paper on it and everyone will think you are on a mission.

Two things. To keep my big mouth shut and to never volunteer for anything.

I took Basic Training over 50 years ago. I will never forget SFC Williams and SSG Mitchell, my Drill Sargents. I am just thankful I can remember their names at this point! That said, both stressed (and yelled) you can do more than you think you can, and they were right. I did a lot of push ups, some with them grabbing the back of my fatigue pants firmly, telling me to get back in the front lean and rest position, so I could start over! DS’s could physically touch you in those days without fear of losing their stripes or worse.

My military left..

How to fire a rifle. I never touched a weapon before basic. including my first time, I have never been below sharpshooter

Discipline

“Pain is temporary, sacrifice if forever”

Not a drill Sargent but as a new LT at my basic course I received some very good advice I remember to this day. After the formal block of training a SFC, the stereotypical old army vet, cautioned us. He basically stated that doctrine is a basis from where we start. By all means learn and apply the doctrine but if you find yourself in a situation where doctrine does not make sense then don’t follow the doctrine and do what makes sense.