 She was reclassified AG–7 in 1919; IX–23, 24 April 1922; and PG–18, 4 November 1940.After shakedown, "Paducah" joined the "Caribbean" Squadron early in 1906 to protect American lives and interests through patrols and port calls to Caribbean and Central American and South American cities.She patrolled Mexican waters in the aftermath of the Vera Cruz incident through the summer of 1914, then returned to her Caribbean operations, performing surveys from time to time.