This requirement is a modification to an existing Department of Homeland Security Science and Technology Directorate (DHS S&T) task order for Critical Infrastructure Security and Resilience Research (CISRR) Program Systems Engineering and Technical Assistance (SETA) support. CISRR requires continued contractor support for scientific and technical expertise, analysis, and program execution support to diverse scientific mission areas. CISRR is currently planning a recompete of its support needs and extension of the current support will prevent a gap in service while the requirement is finalized and acquisition planning, solicitation, and award of the recompete is completed. This modification procures additional work within scope and increases the ceiling of task order 70RSAT23FR0000025 without considering other awardees pursuant to RFO FAR 6.103-1 (FAR Class Deviation 25-11).