Short answers, pulled from the story.
The Saturn IB rocket was an American launch vehicle designed to test command and service modules with partial fuel loads. It enabled separate launches of the lunar excursion module for uncrewed and crewed tests before the final lunar landing missions.
NASA officially named the vehicle the uprated Saturn I on the 12th of May 1966. They reverted the name back to Saturn IB on the 2nd of December 1967 after upgrading the S-I first stage.
Chrysler built the S-IB first stage at the Michoud Assembly Facility in New Orleans. Douglas Aircraft Company constructed the S-IVB second stage in Huntington Beach, California.
Five total Saturn IB launches occurred before the program shifted focus to larger missions. The last operational flight took place on the 15th of July 1975 during the Apollo-Soyuz Test Project.
Launch complexes 34 and 37 at Cape Kennedy Air Force Station hosted early test flights between 1966 and 1968. Engineers later modified Mobile Launcher Platform No. 1 at LC-39B to accommodate height differences for Skylab expeditions.