LM-1 (Apollo 5)

Apollo 5 (also known as AS-204), was the first uncrewed flight of the Apollo Lunar Module (LM), which would later carry astronauts to the lunar surface. It lifted off on January 22, 1968, with a Saturn IB rocket on an Earth-orbital flight.

The Apollo 5 mission tested the lunar module in a space environment, in particular its descent and ascent engine systems, and its ability to separate the ascent and descent stages. The descent engine would become the first throttleable rocket engine fired in space.

The mission also performed a simulation of a landing abort, in which the ascent stage engine would be fired while still attached to the descent stage. This, referred to by engineers as the “fire in the hole” test, was depicted in the mission’s insignia patch.

~wikipedia