It doesn't matter, officer or enlisted ranks, Sgt. Majors scare everybody. It's amusing to see officers cringe when one of these people gets pissed off. The army designation is Sgt. There are some rules to remember when dealing with these people.
Majors have no sense of humor.
They went through basic with God, and are on a first name basis with him. If in doubt, the Sgt. Major is right and there is some part of the instructions you don't understand. These two answers will get a fast response. In Vietnam, this meant burning shit.