Members of the U.S. Navy Ceremonial Guard place the remains of two sailors recovered from the Civil War ironclad USS Monitor onto caissons during a funeral service at Arlington National Cemetery on 8 March. The sailors were interred with full military honors. The Union Navy vessel fought her opposite number, the CSS Virginia, to a draw in the Battle of Hampton Roads on 9 March 1862. The Monitor sank off Cape Hatteras, North Carolina, in December of that year.
The North Koreans detonated a nuclear device in February, apparently their third. Based on seismographic measurements, its estimated yield was 10 to 20 kilotons, about that of the bombs dropped on Japan in 1945. It’s unlikely that the North Koreans simply mass-detonated a great deal of conventional explosive. The seismic signals from such an event apparently would differ from those produced by a nuclear explosion because it would be nearly impossible to trigger all of the explosives simultaneously enough. The U.S. Air Force sent in a specialized nuclear “sniffer” aircraft to collect air samples after the explosion. They may provide evidence of the character of the device. Reportedly this explosion was double the magnitude of the last one, which in turn was much more powerful than the first. Pakistani and Indian nuclear tests also have produced only limited yields, enough to cause serious damage, but nothing on the scale produced by the declared nuclear powers.
It is doubtful that the North Korean device is small enough to be lifted by the long-range missile the country recently tested.
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