The possibility of a nuclear confrontation is considered remote but worldwide alarm has been escalating in recent days.
"We should not be surprised because North Korea has been moving in this direction for years", Mistry said.
"I'm guessing here, but I think you can probably sort of see the handwriting on the wall that some of the missiles that were misfired earlier by the North Koreans probably had some sort of activity by our own people to try and impede their (North Korea's) ability to operate", says Luetkemeyer.
It's not the first time North Korea has threatened Guam, which is a crucial, strategic hub for USA forces in the Pacific. Their location in a USA territory means its military is just hours from potential flashpoints in the western Pacific.
"But Guam is a little bit different, and on the U.S. side, Guam or other USA bases in the Pacific-Asia region may be lost but the United States itself is safe".
"I think we have to be very careful in terms of a military response", Coffman said.
Coffman stresses however North Korea has flown into waters near major countries before - most notably Japan. They threatened US, other countries, and they threaten Guam. "I feel safe with our military presence here - Andersen and the Navy".
Some posters lament the lack of knowledge about Guam on the part of most US residents.
During the Vietnam War, the Air Force sent 155 B-52 bombers to Guam to hit targets in Southeast Asia. But it is as steeped in US culture as any small city on the mainland - even if shoppers at its Kmart (the biggest in the world) can look outside and see a lush Pacific island setting. A huge red, white and blue ribbon is outside the airport terminal. She called the most recent threats from both sides "dangerous" and said they had heightened tensions in the region.
The majority of islanders are ethnically Chamorro - the indigenous group that has lived on the island for thousands of years - and their culture is a touchstone for the islander's way of life.