The Delta II was a reliable expendable launch vehicle used by NASA and other organizations from 1989 to 2018. It was designed to carry satellites into orbit and was known for its versatility, capable of launching various payloads, including scientific instruments and commercial satellites. The rocket had multiple configurations, allowing it to adapt to different mission requirements. Over its operational lifetime, the Delta II completed 155 launches, making it one of the most successful rockets in history. It played a crucial role in deploying important missions, such as the Mars Exploration Rovers and the Global Positioning System (GPS) satellites, contributing significantly to space exploration and technology.