Wasn't the pullout due to the volcanic eruption?
Also philippine senate wanted them out.
Volcanic eruption affected Clarke airbase which is now a civilian airport.
The 1991 treaty between the Philippines and the US would have given the US 10 more years at Subic Naval Base – but 12 senators made the historic decision to vote no
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MANILA, Philippines – On September 16, 1991, 12 senators made history when they made the controversial decision to end years of foreign military presence in the Philippines.
The proposed RP-US Treaty of Friendship, Cooperation and Peace would have given Washington 10 more years at Subic Naval Base, known to be once the largest US military naval base in Asia. It was also one of the
strategic bases for the US, home to more than 7,000 American servicemen and civilian workers.
Other key US military installations here in 1991 were Clark Air Base in Pampanga – formerly known as Fort Stotsenberg – and Camp John Hay in Baguio City.
But by a vote of 12-11, the proposed treaty was rejected by the Senate led by the 12 senators, whom the media later dubbed the "Magnificent 12."
The US military has had a long history in the Philippines, with the signing of the Military Bases Agreement in 1947 that allowed the US to establish and operate air and naval bases for 99 years. An amendment in 1966 cut that tenure to 25 years. The proposed 1991 treaty would have extended the US military presence in the country.