Final answer:
The U.S. Department of Defense (DoD) built and was the first to use the Global Positioning System (GPS), a technology now ubiquitous in civilian life for navigation and location tracking.
Step-by-step explanation:
The Global Positioning System (GPS) was built by the U.S. Department of Defense (DoD) and they were also the first to use it. The GPS system has become a fundamental technology in daily life, used in various applications such as navigation, mapping, and tracking. Initially developed for military purposes, the technology was subsequently made available for civilian use. Although organizations such as NASA and the European Space Agency (ESA) launch satellites for various purposes, including the study of the Sun and other scientific missions, it was the DoD that developed and first utilized GPS technology.