See the Thunderbird HECR warhead with the anti spall liner (see the wing section of Francis Gary Powers' U2 spy plane which came down in Russia about 1962 - see recent Tom Hanks film 'Bridge of Spies' - good film).
See also the SG 357 runway penetrator components, used with the HB876 airfield repair denial bomblet, both dispensed from the JP233 reusable dispenser, but which can be jettisoned if necessary..
The US were going to adopt this but found that the airfields to be attacked had thicker runways than they thought so they adopted the French Durandal penetrator instead, which was a much bigger beast.
See also the SG 357 runway penetrator components, used with the HB876 airfield repair denial bomblet, both dispensed from the JP233 reusable dispenser, but which can be jettisoned if necessary..
The US were going to adopt this but found that the airfields to be attacked had thicker runways than they thought so they adopted the French Durandal penetrator instead, which was a much bigger beast.