as the development of rapid reaction forces and quick mobilization of local reserve forces. As of 2021 training for electronic warfare had been emphasized with significant offensive and defensive capabilities having been fielded. The Han Kuang Exercise is the annual military exercise of the Republic of China Armed Forces for combat readiness in the event of an attack by the People's Liberation Army. Strategy China has removed the phrase "peaceful" in official government documents regarding plans to take back Taiwan. Though the Army had previously been the dominant service, the shift to a defensive orientation has shifted importance to the Navy and Air Force to conduct most fighting away from population centers. Given the current budgetary and numerical superiority of the Chinese military, Taiwan has moved towards an asymmetric anti-access/area denial system to imperil China's ability to operate in the Taiwan Strait rather than try to match its strength. The RoCN, which was once the most neglected force, has become the most important to defeat an invasion fleet. Combating the enemy fleet and sinking transport ships would take out large amounts of the ground invasion force and permanently degrade amphibious capabilities. Surface ships primarily consist of guided missile destroyers and frigates, as well as four dozen small, fast missile boats to take out much larger Chinese surface and amphibious ships. The RoCAF is optimized for air superiority and was once the more formidable of the two countries, but current Chinese technology investments have made China much more able to contest airspace. Air bases are likely to come under attack from Chinese conventional ballistic missiles in range of the island. Taiwan has equipment to keep exposed bases operating while under fire with runway repair systems and mobile aircraft arresting systems. There are two underground air bases used by the RoCAF: Chiashan Air Force Base which is in a hollowed-out mountain that can protect 200 fighters and Chihhang Air Base which can protect 80 aircraft. The RoCAF operates a nationwide air defense network to engage targets anywhere over the mainland; some anti-aircraft missile batteries are also located in underground silos. The Army would only fight if Chinese forces manage to land and would engage in asymmetric warfare. In 2014 Taiwan Minister of National Defense Yen Ming believed that the country would be able to hold off a Chinese invasion for at least one month. In the late 2010s Taiwan's military adopted a