Taiwan began major military drills on Wednesday to test commanders¡¯ ability to fight on the fly when enemy movements defy expectations, while temporarily limiting internet access for the first time, senior Taiwan officials said.

The 10-day annual Han Kuang exercise began early in the morning after ?an underground command center in Taipei issued the drill order, triggering combat-readiness moves that will include fighter ?jet dispersals ?and emergency naval deployments, two senior Taiwan officials briefed on the matter said. Taiwan will also incorporate for the first time a so-called ¡°backbrief¡± approach modeled on U.S. military practice, in which junior officers receiving orders restate mission details to commanders ¡ª a move aimed at improving coordination, the officials added, ?requesting anonymity due to the sensitivity of the matter.

The move, one of the officials said, is to ¡°ensure commanders and subordinates are ?in sync on operational intent.¡±