Solid propellant for rocket motor consists of an oxidizer and aluminum powder cured in a polymeric binder. The oxidizer, ammonium perchlorate (AP) can be readily removed by suitable solvents leaving a residue consisting of aluminum and polymer. Since AP is highly soluble in water, water-washout process was proved to be safe and economical way to remove propellant from the motors. High pressure water-jet was used to remove propellant loaded in rocked motors. The removed propellant was then shredded, macerated with water and filtered to separate non-soluble materials such additives as binder and aluminum used as fuel. After evaporating water from the AP solution, AP crystal was obtained for recycle. Using this process, we safely disposed unserviceable rocket motors and recovered AP with purity above 99%.