Knowledge Storage Media: the M9 Bazooka 

The US Army’s M9 Bazooka was a man-portable recoilless anti-tank rocket launcher used in WW II.

The knowledge of how to hit a tank with this device was stored in several places:

Book:
The M9 Operator’s Manual contained the technical information necessary to load and fire the weapon.  However, the knowledge in this medium could never play an active part in actually shooting at a tank.  To make this knowledge active, it would have to be converted into knowledge-in-brains.  That is, the operator would have to read the manual, understand it, internalize it, and then remember and apply it when called upon to use it in action.

Brain:
The soldiers using the Bazooka were trained [1] and, presumably, by reading the manual, and through training and use would acquire and retain the knowledge of how to fire the weapon.

Hardware:
On the left-hand-side of the M9's tube was a sighting eyepiece and a distance vernier [2].  This vernier is a metal plate with etched markings that “stores” the cosine relationship of distance to elevation.  To use it, the operator would roughly estimate how far away the target was and would then set the vernier to that distance.  By sighting the target through the eyepiece, the angle of the tube would (hopefully) be positioned to land the rocket on the target.  This vernier is a small piece of knowledge-in-hardware and largely removes the need for the operator to retain this knowledge and mentally calculate the optimal weapon angle.

DNA:
While DNA played no part in this weapon system, we do know that some people are intrinsically better shots than others, even after identical training.  We could argue that, if this capability is innate, it is possibly evidence of some DNA-transmitted ability the solider inherited from his parents.

The M-series Bazookas were built long before knowledge-in-software was available.  In modern weapons systems, almost all this knowledge has been moved into the anti-tank missile software.

Firing an FGM-148 Javelin
There are many advantages to storing the knowledge of how to disable an enemy tank in software.  It doesn’t require as much training and expertise; certainly the operator doesn’t have to read, understand, and then remember and correctly apply a manual’s instructions while shooting at an enemy.  The operator can be positioned further away from the target (the M9 had an effective range of only about 300-400 feet).  The software can be updated with latest-version technology.  Most importantly, software is active and can execute the knowledge of how to steer a missile to hit a tank, versus simply describing it as happens with the book form.  With the latest fire-and-forget missiles, such as the US Army’s FGM-148 Javelin, the operator can launch the device and, well, forget about it.  The targeting sensors and the software controlling the missile can recognize an enemy tank, locate it, guide the missile to its target, even apply the best flight profile to avoid countermeasures, all without the intervention of a human.  Once the knowledge of recognizing, locating, steering, and countermeasures has been acquired and loaded into the missile's software, of course.