Sierra L. Billhartz

Sierra L. Billhartz serves as a key procurement professional within the Telecommunications Division (HC1013) of the Defense Information Systems Agency, where she supports the acquisition of mission-critical satellite telecommunications infrastructure to sustain the Department of Defense’s global communications architecture. Her role centers on managing full lifecycle contracts for secure, high-capacity satellite-based network services that enable resilient command, control, and data transmission across military and federal operations. She specializes in complex, technical acquisitions involving satellite bandwidth, ground station integration, and secure virtual private network services, ensuring alignment with DoD cybersecurity and interoperability standards. Billhartz maintains longstanding relationships with leading telecommunications contractors including AT&T Technical Services Company, Inc., Aerospace & Commercial Technologies, LLC, Liberty Communications, Inc., AOC Connect LLC, and Norfolk Fiber, LLC. These partnerships reflect a preference for established industry players with proven capabilities in delivering end-to-end satellite communications solutions, including spectrum management, orbital slot coordination, and encrypted data transport. Her contracting approach emphasizes performance-based outcomes, technical compliance, and operational readiness over cost alone. Her procurement portfolio reflects no set-aside preferences, with 100% of awards issued under full and open competition. This indicates a strategic focus on technical capability and mission necessity rather than socioeconomic targeting, aligning with the specialized and highly technical nature of satellite telecom requirements. Billhartz’s primary NAICS focus is 517410 (Satellite Telecommunications), underscoring her deep expertise in procuring satellite capacity, earth station equipment, transponder leasing, and secure uplink/downlink services. She consistently acquires systems that support military satellite communications (MILSATCOM), protected waveform technologies, and hybrid terrestrial-satellite network architectures, ensuring seamless connectivity for deployed forces and strategic command nodes.