The military relies on the strong analytical and research skills of its engineers and scientists to conduct an array of math and science-related activities needed to execute its missions and everyday operations. Some engineers may design and oversee repairs and improvements to aircraft, missiles, satellites, ships, submarines, and even spacecraft. Space operations experts, for example, are responsible for orbiting satellites and other space vehicles used for national security, communications, weather forecasting, and space exploration. Some scientists may specialize in meteorology or oceanography and recommend to the captain and crew how to steer away from adverse weather or ocean conditions, or advise a rescue team about the ocean tides and currents during a search-and-rescue mission. Other scientists may investigate metabolic processes occurring in organisms and conduct research and experiments to determine how a body reacts and/or adapts to a range of military environments, or they may research activities concerning the effective control of pests and infectious diseases affecting the health, morale, and environment of military personnel.