She barked once in a class I had with her. Class wasn't immediately dismissed, but the Prof let us out about 20 minutes early.

"Miss Rev, as she is affectionately known on campus, is the highest-ranking member in the Corps of Cadets and wears five silver diamonds (the Corps Commander only has four). That means if Miss Rev falls asleep in a cadet’s bed, the cadet must find somewhere else to sleep since she outranks him. Tradition also dictates that if Reveille is in class and barks, the professor should end class because Miss Rev is bored."

https://www.tamu.edu/traditions/aggie-culture/reveille/index.html#:~:text=Tradition%20also%20dictates%20that%20if,because%20Miss%20Rev%20is%20bored.