China has notched another success in its effort to develop a hypersonic weapon, conducting a sixth test of a hyperglide vehicle that U.S. intelligence assesses as favorable to Beijing's effort to develop a next-generation offensive strike weapon, according to a senior U.S. defense official. Adm. Cecil Haney, head of U.S. Strategic Command, revealed the intelligence finding during a Jan. 22 address at the Center for Strategic and International Studies. "They recently conducted [their] sixth successful test of a hyperglide vehicle,"...