I went for the NCC Specialists' Course today. Many teacher officers view taking students to such activities as just a formality and a chore. Although they are there, they do not follow the students. As a result, they learn nothing. They just spend their time at the canteen, or read a book, or do work.
Worse, some teachers don't even come!
For me, I ensure that I always learn something when I take students out to HQ activities. The activities themselves, the content. The organization of the activity. Talking to the other officers and learning something from them.
But I'm glad that there are some teachers who actually function as officers when they are at HQ activities. They lead and teach the cadets, function as safety officers, etc. And they are enthusiastic.