About 20% of active duty personnel engaged in heavy drinking in 2008.
That's the most recent year for available data.
Binge drinking jumped from 35% in 1998 to 47% in 2008.
Prescription drug abuse rates are low, but the rates of medication misuse is rising.
Two percent of active duty personnel reported misusing prescription drugs in 2002, compared to 11% five years later in 2008.