USCGC Marlin is the fourth coastal patrol boat. Her home port is Boston, Massachusetts.
In 2010 Marlin was assigned to help clean up oil from the Deepwater Horizon oil spill.
In 2013 Marlin searched for David Lashley, a Florida resident whose boat broke down off Cedar Key.
On November 3, 2015, the Marlin and participated in the interception and repatriation of 85 individuals who tried to flee Cuba, by sea.