NASA Astronauts Carry Out 300th U.S. Spacewalk

Astronauts Chris Cassidy and Robert Behnken conducted their final spacewalk outside the International Space Station, performing maintenance tasks and preparing for future installations. This marked their fourth spacewalk in a month and tied them for the most spacewalks by American astronauts. Behnken, aboard the SpaceX Crew Dragon, is set to return to Earth with Doug Hurley, marking the first manned splashdown in 45 years.

What was the purpose of the new commercial airlock mentioned in the text?

When was the SpaceX Crew Dragon spacecraft launched?