Short answers, pulled from the story.
Apollo 9 was crewed by Commander James McDivitt, Command Module Pilot David Scott, and Lunar Module Pilot Rusty Schweickart. They were selected by Deke Slayton in April 1966 as the second Apollo crew and had worked together since January 1966.
Apollo 9's main purpose was to qualify the Lunar Module for crewed spaceflight by testing its descent and ascent propulsion systems, demonstrating independent flight, and then successfully rendezvous and docking with the Command Module. The mission also tested the Portable Life Support System backpack used for spacewalks and evaluated the descent engine as a backup propulsion mode.
Apollo 9 launched from Kennedy Space Center at 11:00:00 EST on the 3rd of March 1969, after a delay from the originally scheduled the 28th of February due to the crew developing colds. The mission concluded on the 13th of March 1969 with a splashdown 160 nautical miles east of the Bahamas, lasting 10 days, 1 hour, and 54 seconds.
The command module was nicknamed Gumdrop because of the blue protective wrapping in which it arrived from the manufacturer, and the lunar module was called Spider because of its insect-like appearance with landing legs deployed. The crew had used these names informally during simulations, and despite initial resistance from NASA public relations, the call signs gained official approval.
Schweickart volunteered for medical investigation of the spacesickness he experienced during Apollo 9, but the stigma of his illness meant he was never assigned to another prime crew. He took a leave of absence from NASA in 1977 that eventually became permanent. Apollo 17 commander Eugene Cernan said Schweickart "paid the price for them all" when it came to advancing understanding of spacesickness.
The Apollo 9 Command Module Gumdrop is on display at the San Diego Air and Space Museum. It was previously exhibited at the Michigan Space and Science Center in Jackson, Michigan, until that center closed in April 2004.