A Philippine Navy personnel who previously served aboard the BRP Sierra Madre, one of Manila’s most sensitive military outposts in the South China Sea, is under investigation over alleged illegal drug use, sources have told This Week in Asia. The 34-year-old sailor was also involved in resupply missions to and from the grounded warship, which has long served as an Armed Forces of the Philippines outpost at the Second Thomas Shoal, which Manila calls the Ayungin Shoal. One source who tipped off...