At the northern end of the island, Andersen Air Force Base houses B-1 bombers as well as the Navy's Helicopter Combat Support Squadron Twenty-five.
"[It's] pretty automatic that if there are any threats, especially for those who are in affected areas, they have contingency plans for those things", he said.
In a statement last week, Gen. Kim Rak Gyom, commander of the Strategic Force of the Korean People's Army, said the plan to fire "four Hwasong-12 intermediate-range strategic ballistic rockets.to signal a crucial warning to the US" would be ready by "mid-August".
To that end, USA Today reports, the US territory's homeland security department has released a "fact sheet" so that residents of the small island will know what to do in the unlikely event of a nuclear-missile attack. It aimed to "interdict the enemy forces" in Guam's major military bases, and to "signal a crucial warning to the US", said KCNA.
If carried out, it would be Pyongyang's most provocative missile launch to date while it would nearly certainly spark a response from Donald Trump.
Though officials on the island are clearly mindful of the heated back-and-forth between Washington and Pyongyang, the guidance issued to residents Friday is simply an extension of long-standing public safety practices designed for typhoons and other natural disasters that menace the region.
Of course, if the U.S. determines that North Korea has launched a missile targeting the USA, the President would have to decide whether to retaliate.
Japan and South Korea vowed a strong reaction if the North were to go through with the plan.
On Wednesday, US Defense Secretary James Mattis just warned the regime of Kim Jong-un not to invite its own destruction, while earlier this week US President Donald Trump's threatened that the North Korean regime will face "fire and fury" if it kept presenting itself as a menace. "The U.S. came here because I think they wanted the land and they helped us out with the Japanese, because I think they wanted the land".
Instead, it has been testing missiles at an unprecedented pace and threatening to launch some of those toward Guam.
After North Korea released details of the draft missile plan, Trump commented on his Tuesday remarks, saying, "Frankly the people that were questioning that statement, was it too tough, maybe it wasn't tough enough".
Guam, an unincorporated USA territory, is a strategic outpost about 2,100 miles (3,400 kilometers) south-east of Pyongyang.
"If our past generations dealt with it, so can we", said Santos, the Guam Museum employee, who was born and raised on the island.
"We are prepared for any eventuality, more so than any other American community", he said.
The drill coincides with the four-day "Ulji Freedom Guardian" military manoeuvres on August 21-24, which are held yearly and include joint exercises by the USA and South Korean armed forces, as well as drills for emergencies.
Meanwhile, American and South Korean officials said they would move forward with large-scale military exercises later this month that North Korea claims are a rehearsal for war.
He told CNN that while there was some fear, people were used to living with North Korean posturing. "It is very concerning that there are divisions inside the Trump administration in policy towards North Korea". He said he was willing to meet with North Korean ruler Kim Jong Un, but only under the right conditions.
The White House says that Trump - in a phone call Friday to President Xi Jinping (shee jihn-peeng) - saluted Xi for China's United Nations vote to impose tougher sanctions on North Korea.