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"When you carry out demolitions under combat conditions, the type of drilling carried out by miners is not much of an option –- even the most modern equipment is heavy and cumbersome, and drilling is still a slow process. So military demolitions rely on using large explosive charges.
That is, until the development of the Penetrating Augmented Munition, or PAM, which uses a shaped charge to drill the initial hole, then a second charge fires explosives into the hole:" ...
"ARDEC, the U.S. Army's Armament Research, Development and Engineering Center at Picatinny, New Jersey, has been working on this concept for some years.
The first development was Barnie, which is described as a "unitary demolition warhead."Instead of PAM's multiple charges, it simply has a single shaped charge with a reactive liner. Barnie warheads were tested with several different reactive mixtures, and showed that they performed far better than normal liners. The material could be selected to produce either cratering (suitable for tasks such as destroying roads or runways) or deep damage (for demolitions)."
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