Beijing appears to be testing its 155mm (6.1-inch) naval gun to boost the PLA Navy’s land-attack firepower. The weapon would be the biggest in the People’s Liberation Army’s naval arsenal and could be useful in an amphibious operation against Taiwan. Photos of the massive weapon mounted on the bow of a test vessel have recently emerged on Chinese social media. The location was identified as the Liaonan shipyard in Dalian, in China’s northeastern Liaoning province. The estimated barrel length and...