Is there such thing as "NCO Business?"

CPT (Join to see) absolutley! There have been times that I have counseled sailors and it never got back to the "O". Just because you out rank us doesn't mean that some of us that are senior enlisted don't know how or can't handle business. You have to trust your people that if they decide to keep a counseling at the E level they are doing it for corrective measures and don't need the kid pissing himself any worse than he would when we get done with him. I actually had to tell my division officer (O-1) on my last ship to leave the space, because we were blue shirt counseling. When he told me that this was his space and he could do anything he wanted I informed him very quickly that my boots had been in the Navy longer than he had and that if he didn't leave the space I would force him to leave the space. He left, but reported me to the EMO and Department Head. I explained to both the O-3 and the O-4 (both were Mustangs) that I asked nicely at first and when he refused and shared my feelings with him. They laughed and asked me to think better next time when addressing an Officer. I told them I would, I left and later that day the O-1 apologized to me.

Senior NCOs:

I'm highly confused about this whole "NCO business" versus "Officer business" theory. If you are one who believes there is such a thing as "NCO business", does it matter to you whether or not your CO was formerly an NCO? For example, if your company CO was prior enlisted as a SSG and then became a warrant officer before getting his/her commission, does that nullify the whole "NCO business" concept? Under what circumstances are you willing to acknowledge that your CO knows as much as (or more than) you do about NCO business, or does it not matter how much they know once they've gone to the dark side?

NCOs feed soldiers, officers feed powerpoint.
But seriously, Officers are their to plan and respond to changes in that plan. NCOs are their to execute and give advise to thier officer counterparts.
NCOs are there to keep standards, execute the mission, and maintain the welfare of their soldiers.
Switch your selector switch from safe to semi, and watch, your lane.

Generally, in the Marines, NCO's and SNCO's are the standard bearers on matters of discipline and tradition. Officers get involved when asked, or when there is an obvious threat to life, limb, serialized equipment or clear signs that The SNCO chain is failing (never saw or heard of such a thing as SNCO chain failing, maybe an individual but never the chain).

Absolutely. NCOs are the direct leaders of the troops. Therefore, I expected them to be intimately familiar with the soldiers. For example, I expected the E-5s to know most about the soldiers because they are where the rubber meets the road. I also expected the NCOs to use their vast knowledge for training the unit.