The USCGC Courier (WAGR/WTR-410) was a cutter in the United States Coast Guard converted from the M/V Coastal Messenger a Maritime Commission Type C1-M-AV1 vessel.

She was designed to receive cargo from much larger Victory and Liberty ships and then deliver it to U.S. forces on small outlying islands but was actually never used for that purpose due to the end of World War II.

In the late-1940s, the M/V Coastal Messenger was operated by both the Standard Fruit & Steamship Company and Grace Line, Inc., primarily along the coasts to northern South America.

On a trip to South America she ran aground at La Salina on Lake Maracaibo, Venezuela but was freed after 11 days with extensive, though minor, damage.

[3] President Harry S. Truman visited the Courier on March 4, 1952, when the ship docked in Washington, D.C. and he used the occasion to broadcast a major policy speech beamed at Eastern Europe and the Soviet Union.

[2] On April 18, 1952, during the Courier's shakedown cruise to the Panama Canal Zone, using the call sign KU2XAJ, tests were performed at 1700–2300 on 6110 and 9690 kc.

Placed in "out of commission, in Reserve" status, beginning July 1, 1965, Courier provided dockside training in merchant marine safety and dangerous cargo handling for the next year.