In the past year, as North Korea has ramped up its weapons testing program, those within its sights have begun to take its posturing more seriously. Hawaii has resumed tests of Cold War-era nuclear sirens. A video by Los Angeles
' Health Care Agency offers tips such as, "Get inside. Stay inside. Stay tuned." Public safety officials in Guam have distributed a two-page pamphlet on how to prepare for a nuclear strike. And the Federal Emergency Management Agency has drawn up a day-after survival blueprint for cities.