Hey I found agreat page for you guys and gals (yes now that I am home from OCS I have nothing better to do) The page has video, and mp3 of the various cadence that you will hear when you pt. My advice is pick 2 thta you like and memorize them so that when it is your turn to give cadence when you run you wont fail.
http://www.wjserra.com/enduringfreedom.htm
http://www.wjserra.com/enduringfreedom.htm