A U.S. defense company pleaded guilty on Tuesday to exporting sensitive military technology to foreign countries without a proper license, the Denver Post newspaper said. Colorado-based Rocky Mountain Instrument Company (RMI) has been accused of selling optical prisms and technical data used in various military applications to Russia, Turkey, South Korea and China from April 2005 to October 2007. "The company takes full responsibility for its past failings and I can assure the court that we have put the proper systems in place and we are prepared to move on as a compliant company," the paper cited Steven Hahn, RMI's chief executive officer, as saying. The company sold to Russia, in particular, technical drawings of prisms used by the U.S. Air Force Gunship Multispectral Sensor System for the AC-130 Gunship and in the Improved Bradley Acquisition System, part of the Bradley Fighting Vehicle. A U.S. District Court in Colorado sentenced RMI to the forfeiture of $1 million and to five years of probation and oversight. The prisms and technical data exported by RMI are items on the United States Munitions List of military defense products that companies are not allowed to export to foreign countries without permission from the U.S. State Department.