Huntington Ingalls Industries Inc builds military ships and provides manufacturing and other services to the nuclear energy, oil, and gas markets. Additionally, the company builds and refuels aircraft carriers and submarines. The designing, building, and repairing of ships is primarily conducted through contracts with the United States government, principally the Department of Defense. Many of its products require life cycle support, and teams work together to plan and implement maintenance services. The maintenance may vary from standard repairs and refueling to more technical logistics and assessments. Oil, gas, and energy projects focus on providing management and consultation services to both the private industry and government.