The local government of this tiny US Pacific island issued preparation guidance to its 163,000 people on Friday on how best to hide and deal with radiation after threats by Pyongyang to strike Guam, or test its missiles in its surrounding waters.
The fact sheets didn't seem to cause any widespread anxiety or affect day-to-day Guam life.
Calvo said Wednesday that "there is no change in the threat level resulting from North Korea events" and that "there are several levels of defense, all strategically placed to protect our island and our nation".
North Korea says it is in the final stages of preparing a plan to launch four intermediate-range ballistic missiles over Japan and into waters off the tiny island of Guam, where about 7,000 USA troops are based and 160,000 US civilians live. The fact sheet tells people how to prepare for an attack, and what to do if, heaven forbid, an attack actually occurred.
In the escalating verbal war with the United States, North Korea has warned that it plans to fire four missiles over Japan to Guam, home to a USA military base.
Search under way for diver off Donegal coast
Gardai and emergency personnel have also been called in to help locate the missing person, along with a massive local effort from fishermen.
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".
Those who can't get indoors or behind some type of protections should simply lie down and cover their heads.
The unsettling document also instructs Guamanians to dispose of their clothes and wash heavily if they were outside during or after missiles hit the island, as this would help "remove radioactive material that may have settled on your body".
But do not scratch or scrub skin and "do not use conditioner because it will bind radioactive material to your hair". "Do not pick up your children".
Guam is home to a USA air base, a Navy installation, a Coast Guard group and roughly 6,000 United States military personnel.