The Philippines has a continuing interest in the 378 foot WHECs, after all they already have three, and it appears they may want another. Certainly they and other operators (Nigeria, Bangladesh, and Vietnam) will want to cooperate in finding ways to keep them operational.
An online discussion group called “Defense of the Republic of the Philippines” has a page entitled “Where in the World are the WHECs?” devoted to the topic. It includes both the old and new names and hull numbers. It also looks at the future disposition of 378s still in US Coast Guard service (Sherman, Midgett, Mellon, and Douglas Munro). (Yes we currently have both a USCGC Douglas Munro (WHEC-724) and a USCGC Munro (WMSL-755).
Sherman is expected to be decommissioned in 2018, Midgett in 2019, Mellon in 2020. Douglas Munro’s decommissioning is not currently scheduled but will probably happen in 2021.
The decommissioning information is based on Annex J of a MARAD report, “OFFICE OF SHIP DISPOSAL PROGRAMS ANNUAL REPORT FOR FISCAL YEAR 2016.”