Sgt. Loren B. Taylor, 29, pleaded guilty a day earlier of breaking the ban on sex between commanders and subordinates, having consensual sex with three women recruits and trying to have sex with another.
Two other instructors at Fort Leonard Wood face similar charges.
The charges were disclosed Tuesday, five days after a sex scandal broke at the military's Aberdeen Proving Ground in Maryland, where four drill instructors and a captain have been charged with raping or sexually harassing at least a dozen female recruits.
In another case, The San Antonio Express-News reported yesterday that women Army trainees from Fort Sam Houston kissed their supervisors during wild drinking binges and that one trainee performed oral sex on her supervisor. Five sergeants were disciplined.
Taylor, who had faced up to 14 years behind bars, asked the judge to spare him prison so he could support his 7-year-old son, who lives with his former wife.
But prosecutors, bolstered by the testimony of the victims, asked the judge to send him to prison as a deterrent to others.
Now the high-pitched tone is about to be replaced by a few short buzzes, and the "this-is-a-test" warning may be dropped altogether.
The idea was not to make the tests any less scary to children. Rather, the system for warning the country in the event of a nuclear attack is being modernized, and the buzzes are the sound the new computer technology makes.
The Emergency Broadcast System was designed under President Kennedy in 1963, a year after the Cuban missile crisis, to allow the president to address the nation on a moment's notice in an emergency.
The current test of the system lasts about 35 or 40 seconds; the new one will be shorter, though how much shorter is still unclear. And so far, the Federal Communications Commission has not adopted any requirement that TV and radio stations explain what the digital tones mean. Many stations still might, however, since listeners are likely to wonder.
Though it is unclear what disease - if any - the virus causes, the discovery poses a serious challenge to the burgeoning organ-transplant industry. Only this summer the Food and Drug Administration approved the use of specially bred pigs as organ donors for human-transplant surgery.
British researchers formally announced discovery of PERV, or pig endogenous retrovirus, at a symposium this week in New York.