sentences:  Though JATOs were being mass-produced for military applications, JATO-propelled aircraft could not "keep up" with larger, bomber planes taking off from long aircraft carrier runways—which made Aerojet's industry at risk of becoming defunct.Parsons demonstrated the efficacy of the newer JATOs to solve this issue by equipping a Grumman plane with solid-fuel units; its assisted takeoff from the USS "Charger" was successful, but produced smoke containing a noxious, yellow-colored residue.The Navy guaranteed Parsons a contract on the condition that this residue was removed; this led to the invention of "Aeroplex", a technology for smokeless vapor trails developed at Aerojet by Parsons.