That must mean that they're saving time by getting the 'standby' out of the way beforehand, and now he can just shout "Hack!" out of context any old time he feels like it.
P.S. I don't know what a standard marching pace is either, I just mentioned it because that was supposedly the period of time that you had to wait in formation between a call for something and the actual selection, e.g.
"Flaps, go" - pause - select;
or something like that!
[ 14 December 2001: Message edited by: Arm out the window ]