To answer the original question, a former enlisted special warfare petty officer has graduated from the Naval Academy and became a commissioned officer. A decorated Marine involved in the Beirut bombings has graduated from the Naval Academy and became a commissioned officer. In addition enlisted personnel from a multitude of backgrounds have entered the Naval Academy and have become commissioned officers.
As for the discussion for the upperclassmen and leaving plebes alone...ok? Not sure where this comes from. Upperclassmen have stared in the eyes of combat veterans and high school kids alike expecting the same out of both. They don't leave either plebe alone. As a newly commissioned Ensign I did not "leave my CPO alone" even though he was a Viet Nam brown water navy veteran who could kick my a$$ on any given Sunday. The salty bastard did not wear his Purple Hearts because he said it told the world "he screwed up!!!"
Finally, if detailers had an unofficial policy how could there have been numerous occasions with nasty results?
Hmmm, stay out of Ho Chi Minh trail, Kornhead may get you.
as a newly commisioned ensign, you told your chiefs off? did they ever tell you "listen here ensign ..." ?