"We know what's going on and they're not anxious", said Lewis.
"[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.
According to the U.S. Pacific Command, the drill will include 500 Marines and 18 aircraft operating out of the 35th Fighter Wing at Misawa Air Base, on the northern tip of the island of Honshu.
"If there's really a threat coming, then we'll be able to advise the community and ask support from the Philippine government regarding evacuation and other contingency measures", de Borja said.
North Korea says it will develop a plan by mid-August to launch four intermediate range missiles towards Guam, targeting waters near the United States territory.More news: "Despacito" Is Now the Most-Viewed YouTube Video Ever
In an interview with CNN Philippines' News Night Thursday, Philippine Consul General in Guam Marciano de Borja reiterated plans are in place should North Korea's make good on its threat to fire missiles at the island nation.
Communist North Korea has been nuclear sabre rattling. They have said that America will be defended.
It's not the first time North Korea has threatened Guam, which is a crucial, strategic hub for US forces in the Pacific.
'But I have to say, I'm not laughing now, ' he said.
The United States has maintained a regular bomber presence in the Indo-Asia-Pacific region since 2004. In 2013, state media cited leader Kim Jong Un as having ordered his military to prepare plans on launching strikes on USA military bases in Guam, Hawaii and South Korea as well as the American mainland. Chamorros are the indigenous people of Guam.