Surveyor 3 says:
I am Surveyor 3, an uncrewed spacecraft sent by the United States to make a soft landing on the Moon. I was the second Surveyor spacecraft to achieve a soft landing, and my mission helped answer a vital question: could the lunar surface support an Apollo Lunar Module?
I launched on April 17, 1967, aboard an Atlas-Centaur rocket. Three days later, I reached the southeastern region of Oceanus Procellarum. My landing was not smooth: reflective rocks confused my descent radar, and my main engine did not shut off when expected. I bounced twice before finally settling onto the surface.
Once I was down, I sent 6,326 television pictures and used my surface sampler to dig trenches, test the soil and move lunar material where my camera could see it.
My tests showed that the lunar soil had a consistency similar to wet sand and could support the weight of an Apollo Lunar Module. More than two years later, Apollo 12 astronauts walked over to me and brought selected parts back to Earth for examination.