The U.S. Seventh Fleet now has six Aegis ballistic missile defence ships in the region capable of targeting North Korean missiles, and Japan has a further four.
Chairman of the Joint Chiefs of Staff Gen. Joseph. Though it has been mostly lost as the current round of tough talk keeps escalating, North Korea just a few months ago conducted a similar rehearsal strike on a US military base in Japan.
"There could be a power outage in North Korea that they mistake as a part of a pre-emptive attack". That phrase is something that North Korean propaganda uses a lot.
More recently, North Korean missiles have landed in the Sea of Japan, with some falling in Japan's exclusive economic zone that stretches as much as 200 nautical miles from its shores.
In a guidance note titled "Preparing for an Imminent Missile Threat", Guam Homeland Security advised seeking out in advance windowless shelters in homes, schools and offices, with concrete "dense enough to absorb radiation". Frankly, you could've said that for the last three presidents. "They will fly 3,356.7km for 1,065 seconds and hit the waters 30 to 40km away from Guam".
The March missile launch was not as bold as the plan for Guam - the North didn't tell the world beforehand and deliberately sent the missiles much farther north than the base itself, an easy tweak.
"It's just like setting off fireworks because most of their guided missiles just crash midway through flight", she said. He did not elaborate. "We have an evacuation plan for typhoon, tsunami, terrorism, but we don't have anything for a North Korean missile attack", said a supervisor at one resort, who asked that neither he nor his hotel be identified because he wasn't authorised to speak to the media.
On Friday, the Defense Ministry said it was deploying four of Japan's surface-to-air Patriot interceptors in western Japan to respond to a possible risk of fragments falling from missiles. His remarks are backed by U.S. Defense Secretary James Mattis, who said in California, "My responsibility is to have military options if needed".
The president also predicted a boon in tourism for the USA territory in light of the North Korean threat.
The irreverent young staff behind the counter joke about the North Korean threat - they're even trying to flawless a mushroom cloud design in the foam on their lattes. -South Korea drills begin.
Called Ulchi-Freedom Guardian, the exercises are expected to run from August 21-31 and involve tens of thousands of American and South Korean troops on the ground and in the sea and air.
In Guam's capital Hagatna, residents were unruffled by Pyongyang's rhetoric.
Less than two days after U.S. President Donald Trump declared that North Korea faced "fire and fury" for its nuclear weapons tests, the North released a very detailed plan to "envelope" Guam with four intermediate range ballistic missiles.
Residents on the island have mixed feelings on how anxious they should be that the latest war of words might result in an actual war.
"For me because I'm a father, so it's really concerning, you know, I wish it didn't have to come to that", he said. And apparently, that's because that most of the residue from a nuclear attack actually lands on your clothes.
At a church in central Guam on Sunday, parishioners sang "Lord, we pray for world peace" after discussing the potential North Korean threat.
"There is no panic in Guam", Calvo told CNN.
The hope that it is all just talk, but Arreola says if it's not, Guam is prepared.
"Faith is so deeply rooted into our culture", he said.
President Donald Trump told Guam's governor Saturday morning that the USA territory is "not going to have a problem" and its people are safe.
"Both assured me that the people of Guam are safe", Calvo wrote on Facebook. "They should have had me eight years ago..."
Guamanians are American citizens by birth but not allowed to vote in the American presidential election.
"We're told to keep calm and that we're well-protected, but the reality is we could be here today and gone tomorrow", she said.
"Do not look at the flash or fireball - It can blind you".