Arming submarines with nonnuclear intercontinental ballistic missiles will give America a necessary quick-strike weapon in the war on terror, the vice chairman of the Joint Chiefs of Staff said here June 7. The proposal, part of the Defense Department's 2007 budget request, aims to remove two nuclear missiles from each of the Navy's 14 ballistic missile submarines, or SSBNs, and replace them with two conventionally armed Trident missiles, said Navy Adm. Edmund P. Giambastiani at the Naval Submarine League's annual symposium. The move would put about 22 such missiles into operational deployment, he said. "It's meant to be a very niche capability," Giambastiani told about 400 retired officers, businessmen and fellow submariners. "We're not talking a lot of missiles here.