I recently passed my E6 Promotion Board using the Android App "Leaders Book Database" as my Leaders book. I put in my Soldier's information, the Equipment information that I am signed for and some additional resources and passed. I told another SGT about this and he used it for a Soldier he was sponsoring to the BN soldier of the Quarter and won that board. I used the app on my tablet and he used his cell phone. If you are interested in the app it is at the link at the bottom, and it can export and import info so if you want the resources and references I used, just send me a message.