A man already serving time in a Kansas military prison has been indicted in cold case sex crimes involving three young girls.

Alabama Attorney General Luther Strange said in a statement Wednesday that 45-year-old Billy Wayne Cooper, formerly of Calhoun County, was served with the indictments at the detention barracks of a military base in Fort Leavenworth, Kansas. Cooper is being held there for sex crimes that happened at U.S. Army posts in Washington state and Germany.

Authorities say the alleged cold case sex crimes happened between 1999 and 2004 throughout Calhoun County. Prosecutors haven’t disclosed additional details.

Cooper is facing several charges including rape, sodomy and sexual abuse. The charges indicate that Cooper’s victims were between 13 and 15 years old. It’s unclear if Cooper has an attorney.