China has given a rare acknowledgement that it has built more nuclear missile silos in recent years, with state television airing a documentary on the construction programme.In an interview with state broadcaster CCTV, Cui Daohu, an officer with a PLA Rocket Force engineering unit, described his contribution to building the missile positions that he called China’s “strategic trump cards”, saying the schedule was tight but had been completed on time.“We build homes for missiles. Each position...