The origins of military doctrine and command and control systems / Scott D. Sagan -- Saddam's toxic arsenal: chemical and biological weapons in the Gulf Wars / Timothy V. McCarthy and Jonathan B. Tucker -- The Islamic Republic of Iran and nuclear, biological, and chemical weapons / Gregory F. Giles -- Nuclear arms in crisis under secrecy: Israel and the lessons of the 1967 and 1973 wars / Avner Cohen -- India's nuclear use doctrine / Waheguru Pal Singh Sidhu -- Pakistan's nuclear use doctrine and command and control / Zafar Iqbal Cheema -- The Democratic Peoples' Republic of Korea and unconventional weapons / Joseph S. Bermudez, Jr. -- Terrorist motivations and unconventional weapons / Jessica Stern -- Conclusions: planning the unthinkable / Lewis A. Dunn, Peter R. Lavoy, and Scott D. Sagan.