The Department of Homeland Security (DHS) intends to award a sole source extension for systems engineering and technical assistance (SETA) support services to ManTech SRS Technologies, Inc. for the Office of Test and Evaluation (OTE). The work involves technical, program management, and administrative services to support test and evaluation activities across DHS. The performance period is an extension from June 18, 2026, through November 30, 2026. Services will be performed primarily at government and contractor facilities in the metropolitan Washington, DC area. No budget amount is specified in the notice.