The B61-11 earth-penetrating weapon with a nuclear warhead
The Department of Defense had developed a new generation of bunker buster tactical nuclear weapons for use in the Middle East and Central Asia:
"Military officials and leaders of America's nuclear weapon laboratories [had] urged the US to develop a new generation of precision low-yield nuclear weapons... which could be used in conventional conflicts with third-world nations." (Federation of American Scientists, 2001, emphasis added)
The B61-11 can penetrate and detonate below the earth's surface, creating a massive shock wave capable of destroying underground targets. In tests the bomb penetrates only 20 feet into dry earth, even when dropped from altitudes above 40,000 feet. But even this shallow penetration before detonation allows a much higher proportion of the explosion to transferred into ground shock relative to a surface burst. It is not able to counter targets deeply buried under granite rock. Moreover, it has a high yield, in the hundreds of kilotons. If used in North Korea, the radioactive fallout could drift over nearby countries such as Japan.
Five months after [Assistant Defense Secretary] Harold Smith called for an acceleration of the B61-11 production schedule, he went public with an assertion that the Air Force would use the B61-11 [nuclear weapon] against Libya's alleged underground chemical weapons plant at Tarhunah if the President decided that the plant had to be destroyed. "We could not take [Tarhunah] out of commission using strictly conventional weapons," Smith told the Associated Press. The B61-11 "would be the nuclear weapon of choice," he told Jane's Defence Weekly.
Smith gave the statement during a breakfast interview with reporters after Defense Secretary William Perry had earlier told a Senate Foreign Relations Committee hearing on chemical or biological weapons that the U.S. retained the option of using nuclear weapons against countries armed with chemical and biological weapons. (http://www.nukestrat.com/us/afn/B61-11.htm, emphasis added)
Nukes and Mini-Nukes: Iraq and Afghanistan
The US military contends that "mini-nukes" are "humanitarian bombs" which minimize "collateral damage". According to scientific opinion on contract to the Pentagon, they are "harmless to the surrounding civilian population because the explosion is underground",
The B61-11 is a bon fide thermonuclear bomb, a Weapon of Mass Destruction (WMD) in the real sense of the word.
Military documents distinguish between the Nuclear Earth Penetrator (NEP) and the "mini-nuke", which are nuclear weapons with a yield of less than 10 kilotons (two-thirds of a Hiroshima bomb). The NEP can have a yield of up to a 1000 kilotons, or seventy times a Hiroshima bomb.
This distinction between mini-nukes and the NEP is in many regards misleading. In practice there is no dividing line. We are broadly dealing with the same type of weaponry: the B61-11 has several "available yields", ranging from "low yields" of less than one kiloton, to mid-range, and up to the 1000 kiloton bomb.
In all cases, the radioactive fallout is devastating. Moreover, the B61 series of thermonuclear weapons includes several models with distinct specifications: the B61-11, the B61-3, B61- 4, B61-7 and B61-10. Each of these bombs has several "available yields".
What is contemplated for theater use is the "low yield" 10 kt bomb, two-thirds of a Hiroshima bomb.
