The issue with false charges in the realm of crimes like this is simple. If you're accused of DUI, and you beat the charges, there's little to no lingering stigma.

Someone accused of a sex crime, however, tends to carry the stigma of the accusation with them for years. Want to ruin an NCOs career? Simple, get a lower enlisted to accuse them of sexual harassment. The accusation is all it really takes, the veracity of the charges doesn't matter.