Jamie Leigh Jones says she was raped while working for KBR in Baghdad in 2005. She later sued KBR and Halliburton, which split in 2007.
Halliburton and KBR had argued that Jones' case should be settled in arbitration as required by her contract. A lower court ruled it could go to trial, which is set for May 2011.
The Associated Press usually doesn't name people alleging sexual assault, but Jones' identity has been broadcast in media reports and on her own Web site.