This clip describes how Aerojet started to work on liquid propellant rockets for the US Military, then shows some men working on rocket power plants (the unit created for the propellant).The clip opens with a military plane driving down a runway. MS of some engineers. One of the men use a ruler to point at some graphs drawn on a chalkboard. They discuss thrust in rockets. There are some CUs of chalk diagrams on the chalkboard. Shot of propellant shooting off. Men in jumpsuits work on liquid propellant rockets at Aerojet; the name of the company is printed on the back of their jumpsuits. The camera moves slowly down a line as rocket propellant tanks are worked on.