
A top Pentagon official said Monday that a US missile defense drill would  simulate an Iranian attack - a departure from the usual scenario of a North  Korean attack - according to Reuters. 
"Previously, we have been testing  the [Ground-Based Midcourse Defense] GMD system against a North Korean-type  scenario. This next test... is more of a head-on shot like you would use  defending against an Iranian shot into the United States. So that's the first  time that we're now testing in a different scenario," Lt.-Gen. Patrick O'Reilly,  head of the US Missile Defense Agency, said at the Reuters Aerospace and Defense  Summit in Washington. 
According to O'Reilly, an Iranian attack would be  more challenging than a North Korean attack because a missile fired from Iran  would reach the US "more head-on than from the side," and therefore relatively  faster. 
The test, scheduled for January, is expected to cost about $150  million. During the maneuver the US will fire an interceptor missile from  Vandenberg Air Force Base in California at a mock-Iranian missile which would be  fired from the Marshall Islands in the Pacific Ocean. 
O'Reilly was  speaking just days after diplomats expressed concerns over reports that Iran had  been testing a neutron initiator, a key element in producing nuclear  weapons. 
A neutron initiator begins the implosion that ends with a  nuclear blast. As a component of the nuclear cycle, it has no use in civilian or  military programs, except in the production of atomic bombs. 
On Sunday,  Britain's Times claimed it had obtained confidential intelligence documents from  "foreign intelligence agencies" and quoted a source at an "Asian intelligence  agency" as confirming that Iran had been working on the device "as recently as  2007." 
If the report is correct and Iran began developing the device  while insisting its program was peaceful, it could be a casus belli, Mark  Fitzpatrick, senior fellow for non-proliferation at the International Institute  for Strategic Studies in London, was quoted by the Times as saying. 
"If  Iran is working on weapons, it means there is no diplomatic solution," he said,  adding, "Is this the smoking gun? That's the question people should be asking.  It looks like the smoking gun. This is smoking uranium."