Probably a Knocker (Naval Academy grad known for knocking their graduation rings on tables and also known for arrogant bustards, unapproachable and disengaged)
My apologies to any Knockers on the forum who would definitely not fit this stereotype.
;)
My impression FWIW of academy guys when I was in the Navy is that they were not very good junior officers, but as they became burnished by experience (and not needing to prove anything) they became superb senior officers. When academy Ensigns became LCDR’s and above they weren’t bad at all.
What is “knocking their rings on tables” supposed to mean?