Melchior Acosta Jr optionally retired from the AFP on Nov 2, 2000.
He served as the Chief of Staff of Sen. Greg Honasan from May 1995 to June 2004. He later moved to the National Security Council (NSA), acting as Consultant to NSA Sec. Hermogenes Ebdane. From May 2005-June 2006 he was Technical Assistant to DPWH Sec. Ebdane at MWSS. He then moved to become Deputy Administrator for Customer Service Regulation (DA, CSR), MWSS Regulatory Office (MWSS-RO) from July 2006-June 2011.
He was consultant, Office of Zambales Governor Ebdane from May-June 2017. He has been Deputy Administrator, Customer Service Regulation from June 2017 to the present.
Mel Acosta is currently a Trustee, Metropolitan Waterworks and Sewerage System (MWSS).
Secretary Gregorio Honasan
Senator Panfilo Lacson
Ambassador Eduardo Kapunan
Police General(ret) Ricardo de Leon
Police General(ret) Reynaldo Velasco