She embarked Marines and Seabees stationed in the Dominican Republic and returned them to the United States. On 3 October she sailed for another Mediterranean deployment and participated in amphibious exercises before returning home 31 March 1966. During the next four months Grant County participated in intermittent amphibious exercises along the Atlantic Coast and in the Caribbean.
Grant County transported troops from the Dominican Republic back to the United States. She then sailed for another Mediterranean deployment, participating in amphibious exercises before returning home on March 31, 1966. During the following four months, Grant County conducted training exercises along the Atlantic Coast and in the Caribbean.