Known for its "bunker-busting" capability, the GBU-57 can strike targets as deep as 61 metres and with multiple hits, it is believed to be able to penetrate even deeper. Up until now, it has only been used in tests, but the Americans used its predecessor, the 15,000lb BLU-82 Daisy Cutter bombs, during the Vietnam War, dropping them from the back of Hercules to clear helicopter landing areas in ...