Who can tell me what this is? -Hey up a ree ...

Posted by Elith Chen on January 07, 2002 at

I'm translating a documentary.
It says sth. about American women soldiers of WWII.
Then a woman interviewed recalled the days when they were drilling and marching. She cried,
"Hey up a ree bup a ree bay a left..."
My question is, what's it?
Are they the sounds cried by a drill instructor? You know those "ree", "bup" "bay" just can't be found in a dictionary.
Thank you for your help.