*** Welcome to piglix ***

Adjutant's Call


Adjutant's Call is a bugle call indicating that the adjutant is about to form the guard, battalion, or regiment.)
The top staff is for the Bugler, while the lower staff is for the Drums and the Cymbals.

"Assembly" and "Adjutant's Call" are the two bugle calls that make up the "formation" category of bugle call.



...
Wikipedia

...