arThe 3rd Infantry Regiment (not to be confused with the 3rd Infantry Division) is the Army’s ceremonial unit. Among its subordinate units is The United States Army Drill Team. The ADT serves as goodwill ambassadors to both the US and foreign audiences.
Our own contributor Esli, for what it is worth, is an alumnus of the ADT.
And, for what it is worth, I taught Esli how to march.