All Reliance-class cutters were built with dual shafts and controllable pitch propellers, and were capable of speeds up to 18 knots.

[2] Diligence, the sixth US Coast Guard cutter to bear that name, originally moored in Key West, Florida, later after it completed upgrades during MMA/MEP, was relocated to downtown Wilmington, North Carolina.

Diligence is capable of performing any of the missions that white-hulled Coast Guard cutters traditionally perform, ranging from alien migrant interdiction operations (AMIO) and drug interdiction missions down in the Caribbean, to fisheries protection of the Atlantic seaboard, to search and rescue (SAR) anywhere in between.

On 24 January 2019, the Coast Guard announced that the Diligence would be homeported in Pensacola, Florida by 30 September 2020.

[4] The cutter Diligence was seen in the 1966 science fiction movie Around the World Under the Sea starring Lloyd Bridges.