Assigned to Squadron 3, Atlantic Fleet, "Reid" completed shakedown off Cuba in February 1920; participated in battle practice in March; and on 26 April put into New York. Underway again on 1 May, she steamed south again, touched at Key West, then cruised off the east coast of Mexico until mid-June. By 6 July she was at Newport, Rhode Island, whence she made several runs to New York prior to shifting to Charleston, South Carolina toward the end of September. For almost 3 years she remained on the east coast, operating out of Charleston, Newport, Rhode Island and Yorktown, Virginia. Such coastal operations were occasionally interrupted for brief periods of inactivity at Charleston, due to cuts in personnel.