The US Pentagon has announced the immediate departure of John Phelan, the Navy's top civilian official, amid ongoing military leadership purges. Phelan's exit follows recent dismissals of senior military figures, including Army and Navy leaders, as the US faces unresolved tensions with Iran and internal political pressures. Undersecretary Hung Cao is now acting secretary. The moves reflect a broader effort to reshape military leadership under President Trump, raising concerns about politicization and military cohesion.