df31Aanddf15b-161245_copy1After China tested its DF-31B intercontinental ballistic missile on Sept. 2, the Washington-based Strategy Page said that this new missile with a range of 10,000 poses a serious challenge to the national security of the United States. The report said that China is estimated to have 400 missiles with the capability to carry nuclear warheads. Only a few dozen of them including the DF-5, the DF-31A/B and the DF-41 can reach the United States, however. China is believed to have had about 24 DF-5 missiles in service over the past 20 years. Even though they are capable of reaching the United States, few of them were believed to be operational because of reliability and maintenance problems. More