Short answers, pulled from the story.
Rocketdyne was founded as a division of North American Aviation in 1955, spun off after North American Aviation's rocket engine work for the Navaho missile project demonstrated the commercial potential of a dedicated propulsion division. Its manufacturing plant was established in Canoga Park in the San Fernando Valley of suburban Los Angeles.
Rocketdyne supplied five F-1 engines for the Saturn V's first stage, five J-2 engines for its second stage, and one J-2 engine for its third stage. The H-1 engine powered the Saturn I booster's main stage.
By 1965, Rocketdyne's payroll had grown to 65,000 workers. At that point the company built the vast majority of United States rocket engines, with the Titan rocket's engines being the only major exception.
Rocketdyne became part of Aerojet Rocketdyne in 2013 when GenCorp purchased Pratt and Whitney Rocketdyne and merged it with Aerojet. The space portion of Aerojet Rocketdyne is scheduled to be spun off as a new company named Rocketdyne in the second half of 2026, following an acquisition from L3Harris by AE Industrial Partners.
Rocketdyne's Canoga Park plant was formally established in November 1955 on land designated Air Force Plant No. 56. At its peak it covered 119 acres with some 27 buildings, including over one million square feet of manufacturing area. Demolition of the former facility began in August 2016 after operations moved to the De Soto Avenue campus in 2014.
Rocketdyne acquired full ownership of the former Bluebonnet Ordnance Plant in McGregor, Texas in 1959 and renamed it Solid Propulsion Operations. The facility produced solid rocket motors for the AIM-7 Sparrow III, AGM-45 Shrike, and AIM-54 Phoenix missile systems using a propellant formulation called Flexadyne for nineteen years. Rocketdyne transferred the plant to Hercules Inc. in 1978.