4 inch patch.
This spacecraft was the second Apollo mission to orbit the Moon, and the first to travel to the Moon with the full Apollo spacecraft, consisting of the Command and Service Module, named "Charlie Brown," and the Lunar Module, named "Snoopy." The primary objectives of the mission were to demonstrate crew, space vehicle and mission support facilities during a human lunar mission and to evaluate Lunar Module performance in cislunar and lunar environment. The mission was a full "dry run" for the Apollo 11 mission, in which all operations except the actual lunar landing were performed.On May 22, Thomas Stafford and Eugene Cernan entered the Lunar Module and fired the Service Module reaction control thrusters to separate the Lunar Module from the Command Module. The Lunar Module was put into an orbit to allow low-altitude passes over the lunar surface, the closest approach bringing it to within 8.9 kilometers (5.5 miles) of the Moon. All systems on the Lunar Module were tested during the separation including communications, propulsion, attitude control and radar. The Lunar Module and Command Module rendezvous and redocking occurred 8 hours after separation on May 23. Thirty-one lunar orbits were achieved.