KBR operates two main business segments serving government and commercial customers: Mission Technology Solutions, which provides defense and intelligence capabilities, engineering services, and system integration to the U.S. Department of Defense, Intelligence Community, and international governments including the U.K. and Australia; and Sustainable Technology Solutions, which delivers engineering and professional services to commercial energy, industrial, and sustainability-focused clients through digital optimization, decarbonization, carbon capture, biofuels, and clean energy solutions. The company generates revenue through fixed-price and cost-plus government contracts, engineering services, long-term project alliances, and equity earnings from unconsolidated joint ventures. Both segments serve secular growth markets driven by global security requirements, technology modernization, energy transition acceleration, and climate compliance investments.