The Lunar Landing Research Vehicle-3 was an experimental Vertical Take-Off and Landing (VTOL) vehicle – a fancy hovercraft – that the Apollo astronauts used to practice the lunar landing.
This is part of a NASA collection called “Armstrong Through the Years,” so although it’s not captioned, I have to assume this is a picture of Neil Armstrong in flight. Wikipedia also has a photo of what happened to LLRV-1. Armstrong is using a parachute in that one….
Both Armstrong and Deke Slayton said this was the only way to learn how to successfully pilot a lunar lander. It could only stay aloft for 10 minutes at a time, and its flight characteristics earned it the nickname “The Flying Bedstead.”