Here are five things Oklahoma fans should know about Army before the two programs go head-to-head on Saturday:
Triple option offense can be lethal
Army's use of the triple option attack has been well-documented through the years. It's the great equalizer for service academies, and it helped the Black Knights to a 10-3 season a year ago. Here's how effective it can be: Army already has five players with over 100 rushing yards this season, and all of them are averaging over 4 yards per attempt.
New quarterback Kelvin Hopkins Jr. has also been effective through the air at times, throwing for 420 yards and two scores on just 38 attempts and 18 completions.