The Artemis program is a human spaceflight program by the United States. Missions in the program are aimed at exploration of the Moon, including crewed and robotic exploration of the lunar surface. Three flights of the Orion Multi-Purpose Crew Vehicle are currently planned for launch in the Artemis program in the early 2020s, beginning with Artemis 1. Before Artemis was named, the flights were referred to as "Orion missions". Numerous supporting scientific and technology demonstration missions are planned for launch under the program's Commercial Lunar Payload Services (CLPS), in addition to planned and proposed uncrewed logistical missions to construct and resupply the Gateway and its expendable and reusable lunar landers in lunar orbit.