It served as the Regular Army component of the Harbor Defenses (HD) of Puget Sound, Washington state from 1924 through October 1944, when it was broken up and disbanded as part of an Army-wide reorganization.

[6] A gold metal and enamel device 1 inch (2.54 cm) in height overall the head of a northern lynx cropped facing forward silver gray.

Attached below and to the sides ending in ribbons behind the lynx's ear is a red scroll inscribed "SEMPER VIGILANS" in gold letters.

The distinctive unit insignia was originally approved for the 14th Coast Artillery Regiment on 21 November 1924.

The flaunches of ermine recall "Astoria" and the fur trade in the early days and by their outline on the shield indicate the contour of the straits.