This clip shows rocket power plants (the unit created for the propellant) being filled with fuel and acid at Aerojet.In the clip, the materials of propellants are shown firing up in an experiment. A utility trailer delivers the rocket, where it will be filled with fuel. Valves are checked by men in hazmat suits (acid proof clothing). The men move a hose, and put the nozzle in the rocket fuel tank. They carefully put the hose back. The rocket is then moved for the acid tank to be serviced. The actions are repeated, this time with acid rather than fuel.