Which event prompted the formation of the Alaska Territorial Guard?

The formation of the Alaska Territorial Guard was primarily prompted by the invasion of the Aleutian Islands during World War II. This event underscored the strategic importance of Alaska in the Pacific theater of the war and highlighted the need for local defense forces to protect the territory and its critical locations.

When Japanese forces occupied two islands in the Aleutian chain in June 1942, it became evident that traditional military units could be stretched thin and that local volunteers were necessary to assist in various defense activities, including guarding against further incursions and supporting the military's efforts. The Alaska Territorial Guard was created in response to this urgent need for robust local defense, allowing Alaskans to enlist and play a vital role in their own protection during a time of war.

This focus on local involvement and the necessity of a defensive force against a direct military threat distinguishes this event as a catalyst for the establishment of the Alaska Territorial Guard.