This is a sole-source contract notice for the sustainment and modernization of the Integrated Broadcast Service Enterprise Services (IBS-ES) program, intended for award to Mission Essentials Group, LLC. The work involves comprehensive support including acquisition, sustainment, upgrades, cybersecurity, and program management for U.S. and allied partners. The period of performance is from 20 July 2025 to 19 January 2031, including a base period and options. The program requires Top Secret/Sensitive Compartmented Information (TS/SCI) clearances for personnel, and foreign contractor participation is not permitted. No technical data will be provided as Government Furnished Information.