This is a pre-solicitation notice for OCONUS Integrated Electronic Security Systems (IESS) Sustainment Support, intended for unrestricted competition among SeaPort NxG MAC holders. The period of performance includes a base year and four one-year option periods. The estimated release date for the formal Request for Proposal is March 2026. The draft Performance Work Statement (PWS) contains Controlled Unclassified Information and requires a signed Non-Disclosure Agreement submitted to a specified point of contact for access.