Weapons Of Mass Destruction
nuclear, chemical, biological, etc.
even "conventional" weapons with sufficient range and total-power (e.g. lots of long-range non-nuclear missiles)
RAND "Individual Preparedness and Response to Chemical, Radiological, Nuclear, and Biological Terrorist Attacks" http://www.rand.org/publications/MR/MR1731/
War On Iraq, Colin Powell, David Kay, etc.
Colin Powell speech to UN: [z2003-02-25-ReasonOnPowellIraq]
Oct3'2003 David Kay says no longer sure that trailers were WMD labs. (He had been on TV on Jul15'2003 saying "I've already seen enough to convince me." Those trailers had been found in April/May, but there had been "tips" about them prior to Colin Powell's UN speech.)
Feb4'2004 review of Colin Powell's claims vs what's been confirmed since
Mar3'2004 article about David Kay's Jan28'2004 testimony "We were all wrong."
Apr3'2004 Colin Powell concedes evidence may have been wrong, blames it on the CIA