A Dec. 12 article incorrectly reported that the United States possesses no more VX nerve agent. The Army destroyed the last of its VX stocks on Johnston Atoll in November 2000, but other stocks await destruction elsewhere.

Citing U.S. government officials, a Dec. 12 article misidentified as Asbat al-Ansar an al Qaeda-affiliated group in northern Iraq. The group is Ansar al-Islam.