Guam, a 210-square-mile island, is a USA territory in the Pacific Ocean. The U.S. recaptured the territory three years later. "Hopefully Kim Jong Un will find another path!"
"I feel that the presence of the military on Guam will help us a lot", said Virgie Matson, 51, a resident of Dededo, Guam's most populated village. An air base with long-range bombers and a naval base that's home port for fast-attack submarines are among the most "strategically important" the US has in the Pacific, according to the CIA World Factbook.
As an unincorporated United States territory, citizens of Guam can not vote in general elections.
"Things will happen to them like they never thought possible, OK?" While already taking up 30 percent of the island, the American military has been seeking to increase its presence by relocating to Guam thousands of Marines who are now based in Okinawa, Japan.
The U.S. keeps a Naval base and Coast Guard station in the south, and an Air Force base in the north that saw heavy use during the Vietnam War. Most recently, in March 2013, North Korean military officials made a statement about Andersen Air Force Base being within "striking range".
The official languages of Guam are English and Chamorro, which means 'noble.' It's a Malayo-Polynesian language that has incorporated Spanish words over time.
Aegis is able to track 100 missiles simultaneously and fire interceptors to take out an enemy's ballistic projectiles. And at the southern end, there's the Naval Base Guam that hosts the Submarine Squadron Fifteen and the USS Frank Cable.
"The way our infrastructure is built - an 8.3 quake a decade ago, powerful typhoons - they are well-equipped to coordinate both pre-event and also post-event", he said. Andersen Air Force Base hosts a Navy helicopter squadron and Air Force bombers that rotate to Guam from the US mainland.
Guamanians have served in all major USA wars since World War II and see military service as a source of pride. The tourist district of Tumon, home to many of Guam's hotels and resorts, is in between. It has two 2-mile (3-kilometer) -long runways and large fuel and munitions storage facilities.
The North then came out with a threat to lob four intermediate-range "Hwasong-12" missiles near Guam, a tiny USA territory some 3,200 kilometers (2,000 miles) from Pyongyang.
A key USA military stronghold, Guam was the departure point for US B-52 bombers that attacked Hanoi during the 1955-1975 Vietnam war.
Whether or not North Korea follows through with its threat, which is really just an announcement of the intention to create a plan to present to Kim, it has already dealt a severe blow to the US's credibility.
Guam is armed with the U.S. Army's defense system known as Terminal High Altitude Area Defense, or THAAD, which can intercept missiles.
Japan's missile defences include sea and land components.