The ships that were on loan to the U.S. Coast Guard were used in a variety of roles, including search and rescue, interception, boarding, and inspection of foreign freighters arriving at United States ports.

As a U.S. Coast Guard cutter, Monsoon, along with USCGC Boutwell helped with the arrest of Mexican drug kingpin Francisco Javier Arellano Félix in 2006 while he was deep-sea fishing off the Baja Peninsula.

As of 2015, ten of the U.S. Navy's 13 Cyclone-class patrol ships including Monsoon were deployed to Naval Support Activity Bahrain in the Persian Gulf, to deal with a potential conflict with Iran.

[5] The remaining three ships of the class are slated to be transferred to Naval Station Mayport in Florida to primarily perform drug interdiction duties with U.S.

[2][8] She was rechristened as BRP Valentin Diaz (PS-177) on 11 September 2023, in honor of a Filipino revolutionary in its war of independence from Spanish colonial rule.