But Raymond Kuo, political scientist at Fordham University in NY said: "There are no good military options that wouldn't result in deaths of thousands in the first day, and even then it might not eliminate DPRK capability".
The U.S. set up the Naval Station in Guam in 1899, designating the whole island as a base.
It test-fired an intercontinental ballistic missile twice in July, making it realistic that North Korea will deploy nuclear missiles that have the US mainland within their range.
"My initial impression would be - not really", Mr Gatling said.
At the end of July, North Korea test-fired an improved intercontinental ballistic missile (ICBM), a Hwasong-14, that could strike the USA mainland, purportedly, as far east as Chicago.
On Saturday, some of Japan's land-based Patriot Advanced Capability-3 (PAC-3) missile interceptors began arriving at Japanese Self Defense Forces (SDF) bases in three of the four prefectures any North Korean missiles would likely fly over en route to Guam.
On Thursday, NBC News reported that the Pentagon had prepared a specific plan for a pre-emptive strike on North Korea's missile sites should Mr. Trump order such an attack.
North Koreans have lived for decades with the state media message that war is imminent, the U.S.is to blame and their country is ready to defend itself.
Guam serves as a launching pad for the US military.
"The military action the KPA is about to take will be an effective remedy for restraining the frantic moves of the United States in the southern part of the Korean peninsula and its vicinity".
President Donald Trump is seeking continued help from China's president in addressing the threat posed by North Korea's nuclear developments.
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A Democratic congressman is urging House Speaker Paul Ryan to reconvene the House from its summer recess to consider legislation prohibiting a pre-emptive nuclear strike against North Korea. It aimed to "interdict the enemy forces" in Guam's major military bases, and to "signal a crucial warning to the US", said KCNA. "But they don't come out explicitly", he said.
At a park in central Pyongyang Friday evening, young people practiced volleyball and grandparents and parents watched children on climbing frames and swings.
In a statement this week, Bordallo called North Korea's threat to target Guam "dangerous", saying she has discussed threats with Mattis and other defense leaders, who have "consistently reassured me that Guam is protected". "It is just a shame that such infrastructure is not advertised well to the public and that we are short of emergency supplies", said Yang Uk, senior fellow at Korea Defense and Security Forum, a research institute in Seoul.
"But I have to say, I'm not laughing now", Thompson said.
Pairs of B-1s from there have conducted frequent practice runs over Japan and South Korea in recent months, accompanied by fighter jets from the two allies.
She added: "I think escalating the rhetoric is the wrong answer".
North Korea has short-range missiles that can hit its neighbors. "They're not going to die here and (President Donald Trump) told me that to my face".
Trump tweeted: "Military solutions are now fully in place, locked and loaded, should North Korea act unwisely".
That puts its total population of 170,000 in range of the Hwasong-12 intermediate-range ballistic missiles that Kim Jong Un's regime has threatened to fire as a counter-punch to President Donald Trump's caution that the US would respond with "fire and fury" to provocative actions by North Korea. The fact that both President Trump and Kim Jong Un share a leadership style that values unpredictability raises chances of misunderstanding and/or misperception.
"If it (North Korea's ballistic missiles launch) disintegrates atmosphere potentially, it would have shattered debris that may scatter around in the area or its trajectory".