When I was in the Army in Germany awaiting my Top Secret clearance so that I could assume my responsibilities as a nuclear weapons officer, I was given an Admin assignment as the battalion Adjutant. I shared an office with the Sergeant Major who had very little regard for second lieutenants. One of the things I did observe about our SGM was that he did like to make his point in a unique way.
One day he said that he did not think my Arms Room was secure. That was on of the responsibilities of the Adjutant. He suggested we go to the Arms Room and inspect the security. He took my clerk along on this inspection. After we toured the facility, he told me that there would be a note from him on the desk the next morning. My response was NO WAY.
To my surprise the next morning when I unlocked the Arms room there was the note from the SGM telling me my Arms Room was NOT SECURE. I went back to my office where I met a rather satisfied SGM sitting at his desk. I obliged him and asked him how he was able to get into the room? He told me that he noticed that when I took the two locks off the outer door, I hung them on the hasps open. That allowed him, with the help of the clerk to replace my locks with a set he had. After I secured the room he went to the room unlocked his locks and replaces then with my two locks.
The SGM could just have easily simply have told me to make sure I locked the locks on the hasps so no one would replace them. However his little demonstration was a very effective teaching tool and that lesson I remember some 40 years later.
SMG Jessie Katrel and I were able to work very effectively together during the two years I was assigned to the 2/75th Artillery.