AOK, I have thought about this and have questions.
I see what you are saying about the military vs the student/teacher type of situation. In one, “ours not to reason why, ours bit to do and die;” in the other, it’s a learning process.
Now, people become Catholic either when they are children or when they are adults. If they are children, then they should be “discipled” by their parents and other around them.
If they are adults, they are supposed to go through a process of learning, which perhaps ought to be a period of discipleship.
Thus, theoretically every adult Catholic should have a basic knowledge of the Big Rules. There should be no adult Catholics who are unclear about the sinfulness of using abc for contraceptive purposes, for example.
So, having been discipled, (excluding those who were badly discipled), they should, if they agree that the Church is God’s vicar and has the authority to determine this, then they should say, Whatever my conscience is throwing at me, I need to follow Church teaching.
So, I can see using the military type of deontogy for “adult” Catholics, but in that case, I can also see obligating “disciples” who are in the beginner stages to refrain from receiving the Eucharist if they are “committing (objectively) mortal sin.” (I understand this is an outdated phrase, but please just let that slide!)
Does that make sense?