WFIR-LOGO-1ROANOKE, Va. (AP) _ A former contract worker at the Radford Army Ammunition Plant has pleaded guilty to charges he sexually assaulted three fellow workers.   The government says Joshua Linkous of Dublin, Virginia, entered his pleas Tuesday in U.S. District Court in Roanoke. Under a plea agreement, the 39-year-old defendant will be sentenced to between 10 and 15 years in federal prison and at least 15 years of supervised release. He will also be required to register as a lifetime sex offender. Linkous pleaded guilty to one count of aggravated sexual abuse by force and two counts of abusive sexual contact. Acting U.S. Attorney Anthony P. Giorno described Linkous’ actions as “deplorable.” He said Linkous used his position and power to submit his victims to unwanted sexual contact.