The governor's office says the proclamation "is a precautionary measure in reaction to recent instances of civil unrest across the country."

The National Guard has at times detained protesters in its deployment to Los Angeles, an official said Wednesday, as demonstrations against Immigration and Customs enforcement raids spread to other major cities.

With immigration enforcement protests planned for June 14 in Missouri, the governor has activated the National Guard as a precaution.

Operation ORCA is an interagency joint training exercise conducted in Alaska every two years. Participants simulate detecting and responding to emergencies such as chemical, biological, radiological and explosive threats. In total, about 100 personnel will be traveling to Juneau to participate.