Here's the breakdown:

* Apollo 11 in 1969 was the first mission to land humans on the Moon. This is absolutely true. Neil Armstrong and Buzz Aldrin were the first humans to walk on the lunar surface.

* NASA was the agency responsible for the Apollo 11 mission. This is also true. NASA (National Aeronautics and Space Administration) is the US government agency responsible for space exploration.

* However, it's important to note that the Soviet Union had already landed unmanned spacecraft on the Moon in 1959 with the Luna 2 mission. They were also the first to land a spacecraft on the Moon and return it to Earth with Luna 16 in 1970.

Therefore, while Apollo 11 was the first manned mission to land on the Moon, it wasn't the first mission overall.