The 8th Coast Artillery Regiment was a Coast Artillery Corps regiment in the United States Army, which garrisoned the Harbor Defenses of Portland (HD Portland), Maine 1924–1944, and the Harbor Defenses of Portsmouth, New Hampshire 1924–1940.

[1] The 8th Coast Artillery was constituted 27 February 1924 and organized 1 July 1924 as the Regular Army component of the Harbor Defenses of Portland (HD Portland), Maine through early 1944; the 240th Coast Artillery was the Maine National Guard component of those defenses.

[1] In early 1944 most of the 8th Coast Artillery's personnel were transferred to HD Portland and the regiment was soon disbanded.

A Gold metal and enamel device 1 1/8 (2.86 cm) in height overall consisting of a shield blazoned: Per fess Gules and Argent, in chief a mullet of the last, in base a pine tree Proper.

[2] On a wreath of the colors Argent and Gules a phoenix Purpure aileroned Or rising from flames Proper.

"Terrae Portam" is also the Latin equivalent for Portland and "Defendamus" is the motto of the Coast Artillery Corps.

[2] The crest is taken from the arms of the city of Portland which was thrice destroyed in war by burning, by the Indians in 1676, by the French in 1690 and by the English fleet in 1775, but each time it has risen phoenix-like from its ashes.