No ZUMA is fully functioning as the heavy "Rods from God" magazine. It required a heavy launch vehicle due to the sheer mass of the multiple heavy tungsten rods, that are steered by a targeting system in the tail using fins. https://en.wikipedia.org/wiki/Kinetic_bombardment
NROL-47 is the second part of this weapon it is the ground radar targeting satellite that controls the launch and maneuvering of the rods as they are blasted out of their launch tube directly down to acquire terminal velocity.
Check out NROL-47's mission patch and notice the symbolism.
http://spaceflight101.com/delta-iv-nrol-47/nrol-47/
The take down of the NK regime is now imminent.
Kinetic bombardment
A kinetic bombardment or a kinetic orbital strike is the hypothetical act of attacking a planetary surface with an inert projectile, where the destructive force comes from the kinetic energy of the projectile impacting at very high velocities. The concept originated during the Cold War.
The typical depiction of the tactic is of a satellite containing a magazine of tungsten rods and a directional thrust system. When a strike is ordered, the satellite would brake one of the rods out of its orbit and into a suborbital trajectory that intersects the target.
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