 The DF-21D is thought to employ maneuverable reentry vehicles (MaRVs) with a terminal guidance system.It may have been tested in 2005–6, and the launch of the Jianbing-5/YaoGan-1 and Jianbing-6/YaoGan-2 satellites offering targeting information from radar and visual imaging respectively.The upgrades enhance China's ability to prevent US carriers from operating in the Taiwan Strait.