By far the best investment in ensuring you pass your CDCs with solid scores. I will always turn to McMillan Study Guides throughout my Air Force career. Thank You, McMillan! (Master Your CDC)

Made SSgt this time around! Great and FUN study tool! HIGHLY recommended. (Master Your CDC)

Used PDG Advisor and made an 81 on the PFE. My highest PFE score ever! Promoted to MSgt at an 18% promotion rate.