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The key piece of evidence is that the facility is operating a' burn pit' to dispose of solid-propellant leftover from the production of ballistic missiles, casting rocket motors results in leftover propellant, which is an explosive hazard. Solid-propellant missile production facilities often have burn pits where leftover propellant can be disposed of by burning. Burn operations are, therefore, a strong signature that the facility is actively casting solid rocket motors.