Systems Engineering Support CO.

Systems Engineering Support CO., doing business as Sesco, a San Diego-based minority-owned and veteran-owned small business, operates as a prime contractor supplying systems engineering, hardware production, and technical services for naval combat and information systems to the Department of the Navy. Sesco is a self-certified small disadvantaged business and Subchapter S corporation that competes predominantly full-and-open (no set-asides dominate the award footprint), though individual delivery orders frequently carry Total Small Business designations reflecting the company's small-business status and Navy procurement practices.

Sesco's capability portfolio centers on specialized hardware production, systems integration, and engineering support for Navy positioning, navigation, and GPS anti-spoofing systems. The company manufactures and assembles Selective Availability Anti-Spoofing Module (SAASM) configurations (A, B, and B-variant products), platform backfit kits, and components for the Tactical Tomahawk Weapons Control System. Sesco also provides spare parts, direct materials, and engineering services for surface warfare platforms including the DDG 51 Arleigh Burke Class Guided Missile Destroyer. Representative recent work includes a $21.1 million delivery order (May 2025) for SAASM Configuration B1 hardware under the Naval Information Warfare Systems Command's $211.4 million multiple-award IDIQ, a $4.59 million Total Small Business delivery order (September 2025) for Tactical Tomahawk equipment kit procurement and assembly under Naval Sea Systems Command's $52.86 million single-award IDIQ, and a $2.89 million delivery order (December 2025) for spare parts and engineering support under the SAASM program.

Customer concentration is extreme and Navy-centric. The Naval Information Warfare Systems Command accounts for 226 awards and $646.7 million in combined potential value (91% coverage of the top five customers), with Naval Sea Systems Command contributing 37 awards and $65.7 million. The remaining 15 named federal customers are negligible by volume and dollars — the Navy represents the entire strategic footprint. Sesco's recent expansion includes participation in the Missile Defense Agency's Scalable Homeland Innovative Enterprise Layered Defense (SHIELD) multiple-award IDIQ, awarded December 2025 with a $151 billion ceiling and a modest $500 delivery order issued immediately, positioning the company for potential longer-term missile defense work.

Sesco holds four primary parent vehicles: the Naval Information Warfare Systems Command's $211.4 million hardware production IDIQ (multiple-award, completion September 2026, 55+ task orders historically placed); Naval Sea Systems Command's $52.86 million Tactical Tomahawk IDIQ (single-award, completion September 2029); Naval Information Warfare Systems Command's $95.99 million Network Integration Engineering Facility (NIEF) Production Support IDIQ (multiple-award, completion December 2032, awarded December 2025); and the Missile Defense Agency's $151 billion SHIELD IDIQ (multiple-award, completion December 2035, newly awarded December 2025). Legacy vehicles tracked in the award portfolio include the Navigation Sensor System Interface Follow-on (39 task orders, $10.4 million combined value) and several older Naval Information Warfare Systems Command IDICs (N6600118D0013, N6600115D0058, N6600113D0078, N6600102D0021) that collectively generated hundreds of delivery orders through the early 2020s.

Activity has contracted over the past three fiscal years — from 13 awards in 2022 to seven in 2024 — with recent resurgence (ten awards in 2025 and one in 2026 year-to-date), primarily driven by newer vehicle activity and SHIELD participation rather than legacy IDIQ task orders. Five awards totaling $25 million in combined potential value reach ultimate completion within the next twenty-four months, creating moderate recompete pressure on core SAASM and Tomahawk delivery orders. Sesco operates as a pure prime contractor (100% of awards), with no subcontract footprint in the source data and minimal Service Contract Inventory activity (SCI reported 0.4 FTEs in FY2022, indicating Sesco's business model is goods and delivery orders rather than billable-hour service contracts above the $150,000 SCI threshold).

Systems engineering, systems integration, fabrication/assembly, electronic engineering, rapid prototyping, product improvement, R&D, information technology, network engineering, communications, information systems engineering