The note also asks Guam's residents to "take time to talk" to family members or co-workers who might be troubled after North Korea vowed to ignite an "enveloping fire" of test missiles near the island, which is a USA territory.
"The Hwasong-12 rockets to be launched by the KPA will cross the sky above Shimane, Hiroshima and Koichi Prefectures of Japan".
Aegis is able to track 100 missiles simultaneously and fire interceptors to take out an enemy's ballistic projectiles.
It follows earlier comments in which he said North Korea would see "fire, fury and frankly power, the likes of which this world has never seen before" if it continued to push its nuclear program, leading to a threat against Guam from the rogue state.
"So there are capabilities in different varying degrees between North Korea and Guam, and the THAAD system happens to be the last in a line or layer of a defensive shield". "This might make North Korea think that's just some verbal threat, so its attitude is getting tougher and tougher".
Those urging firmer action assert that a military buildup in and around South Korea could give economic sanctions and diplomacy more time to work while providing American negotiators with more leverage.
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.
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.
On Thursday, the USA military launched another exercise in the region, teaming up with its Japanese counterparts.
Reopening dialogue with Pyongyang is crucial for Moon, who says the South should take the lead when it comes to solving the North Korean nuclear problem.
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According to the Virginia State Police, before the start of the rally two people have already been injured from an altercation. We stand for inclusion and will not go backwards.
The aim, he continued, was "to contain the USA major military bases on Guam including the Anderson Air Force Base, in which the US strategic bombers, which get on the nerves of the DPRK and threaten and blackmail it through their frequent visits to the sky above south Korea, are stationed and to send a serious warning signal to the U.S".
America's day may begin in Guam, but people who live there don't exactly want it to be the place to start on another world war.
"There's a lot of disbelief going on, there's a lot of anxiety", Father Paul Gofigan told CNN after the mass.
Lying roughly 2,000 miles southeast of North Korea, Guam is about three times the size of Washington DC and has a population of 178,000 people.
"Faith is so deeply rooted into our culture", he said.
A nuclear war between North Korea and the United States is not imminent, analysts said, but the inflammatory rhetoric on both sides is increasing the risk.
"If there was to be conflict in this region, understand that there is an archipelago, 600 miles long called the Marianas that encompasses two United States territories - Guam and the Commonwealth of the Northern Marianas", he said. The island is also home to a large USA military presence, a fact that has led to tension with some local residents, particularly those of the indigenous Chamorro community.
"My initial impression would be - not really", Mr Gatling said.
"You're playing with people's lives".
"We will no longer allow this to continue".