Stuxnet, a computer worm reportedly developed by the United States and Israel that destroyed Iranian nuclear centrifuges in attacks in 2009 and 2010, is often cited as the most dramatic use of a cyber weapon.

The United States, a signatory to the Chemical Weapons Convention, destroyed the last of its stocks of VX and other chemical agents on the Johnston Atoll, 825 miles southwest of Hawaii, in November 2000.

Enclosed by a sand berm four miles around and 160 feet high, the Baghdad Nuclear Research Facility entombs what remains of reactors bombed by Israel in 1981 and the United States in 1991. It has stored industrial and medical wastes, along with spent reactor fuel.

If there were Israeli attacks on Iranian nuclear facilities, it makes it certain there would be a reprisal attack against the United States at some point.

As a nuclear power - as the only nuclear power to have used a nuclear weapon - the United States has a moral responsibility to act.

What are the implications of a China that may be on nuclear parity with the United States?