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bodies, large-caliber tank ammunition, medium-caliber ammunition, military propellants, mortar, and artillery projectiles. OTS is also the systems integrator for the next generation of artillery solutions in support of the Army’s Indirect Fire Modernization objectives. Additionally, OTS maintains a leading position providing missile subsystems in support of U.S. tactical and strategic missiles, provisioning both legacy and next-generation missiles with critical aerostructures, control actuators, high-performance warheads and cutting-edge hypersonic rocket cases. 

Revenue for the Combat Systems segment was 19% of our consolidated revenue in 2020, 18% in 2019 and 17% in 2018. Revenue by major products and services was as follows: 

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## TECHNOLOGIES 

Our Technologies segment provides a full spectrum of services, technologies and products to an expanding market that increasingly seeks solutions combining leading-edge electronic hardware with specialized software. The segment is organized into two business units — Information Technology (GDIT) and Mission Systems. Together they serve a wide range of military, intelligence and federal civilian customers with a diverse portfolio that includes: 

• information technology (IT) solutions and mission-support services; 

• mobile communication, computers and command-and-control (C4) mission systems; and 

• intelligence, surveillance and reconnaissance (ISR) solutions. 

This market has experienced a series of structural shifts in recent years, and our response to those trends has further solidified our position as a market leader. Over the past decade, the Department of Defense (DoD), the intelligence community and federal civilian agencies have increasingly prioritized technology solutions as a critical element of their missions. Cloud computing capabilities, cyber security threats, and advancements in artificial intelligence have transformed technology resources from short-cycle back-office support functions to a strategic priority for this customer community. The result is a significant increase in federal IT modernization and technology investments in recent years and a shift to large-scale, end-to-end, highly engineered solutions that require critical mass and a broad array of technology services and hardware offerings to meet these customer demands. The recent Coronavirus (COVID-19) pandemic has only accelerated these trends, which have included an expansion of remote connectivity and added urgency to required technology investments. 

These market shifts have resulted in significant consolidation in the industry in recognition of the scale and breadth of capabilities required to meet this growing demand. In response to these market dynamics, in 2015 we combined our C4 and ISR operations into a single Mission Systems business unit, and in 2018 we acquired CSRA, Inc. (CSRA), which doubled the size of our IT services business, brought critical capabilities and repositioned the segment as a leader in this market. 

During the three years following the acquisition of CSRA, GDIT and Mission Systems have undergone considerable portfolio shaping and realignment. At the top level, the two businesses share the same defense, intelligence and federal civilian customer base and increasingly go to market together to meet the ever-changing information-systems and mission-support needs of these customers. In addition, 

