Mark Green (R-Tenn.), follows news media reports as well as a Congressional investigation into the extensive contamination at the K2 Air Base, which the U.S. leased from the Uzbek government from 2001 to 2005. Some 15,000 service members passed through the base during that time, supporting military operations in northern Afghanistan after the Sept. 11, 2001, attacks on the World Trade Center and the Pentagon. Declassified Pentagon documents showed evidence of numerous chemical and radiation hazards at the base. They included radioactive processed uranium, leftover materials used in chemical weapons and a “black goo” oozing from the ground where underground pools of fuel and solvents had been buried, according to an investigative report by the McClatchy News Service. The news outlet reported that Pentagon officials had been aware of the hazardous materials from the beginning of the K2 Air Base lease in 2001.