After the fall of Saigon in the summer of 1975, hundreds of thousands of refugees fled Vietnam. Thousands of these refugees were rescued at sea by U.S. Navy ships and taken to Subic Bay. A temporary processing centre that treated thousands of refugees was established on Grande Island in 1975. They were then taken to the Philippine Refugee Processing Center in Morong, Bataan. The 1947 Military Bases Agreement was amended in 1979 and changed the role of americans in Subic Bay from owner to guest. The amendment confirmed the Philippines` sovereignty over the base and reduced the area reserved for U.S. use from 244 square kilometers (94 square miles) to 63 square kilometers (24 square miles). Philippine troops have taken responsibility for the security of the base`s perimeter in order to reduce incidents between the U.S.
military and Filipino civilians. The unhindered operation of U.S. forces has been secured. The United States has provided the Philippines with $500 million in military sales credits and support assistance. In June 2012, the Philippine government said the U.S. military could use the former base with prior permission from the Philippine government. This follows the expansion of military relations between the two nations and a US turn to Asia.  This follows a 1999 visiting forces agreement that provided for annual visits by U.S. forces to conduct large-scale exercises (known as Balicatan) between the two allies.  The Sydney Morning Herald reported on November 20, 2012 that Subic Bay will house U.S.
ships, marines, and aircraft on a semi-permanent basis, giving the U.S. a strategically important position of strength for its movement to the Pacific, according to analysts.  The U.S. Navy began using Subic Bay Base in 2015 to provide equipment and personnel for annual joint military exercises.  Some 6,000 U.S. troops came to Subic in April and returned to the exercises in 2016 in agreement with Philippine authorities.  U.S. ships have used Subic Bay as a supply port for routine calls.  The agreement allows the United States to do so. At the invitation of the Philippine government, the forces have access to and use designated areas and facilities belonging to the Armed Forces of the Philippines. It contains clear provisions that the United States will not establish a permanent military presence or base in the Philippines and a ban on the entry of nuclear weapons into the Philippines.
 The EDCA has an initial term of ten years and remains in effect thereafter until terminated by one of the parties after one year`s notice.  By the mid-1930s, the Nazis had taken power in Germany and Japan was beginning to show its military muscles. The United States Congress has therefore approved the release of funds to update the coastal defenses of Manila and Subic Bays. President Franklin D. Roosevelt would complete this by ordering the integration of the Philippine armed forces into the newly created U.S. forces in the Far East. General Douglas MacArthur, who had served as a military adviser to the Government of the Commonwealth of the Philippines and was also Marshal of the Philippines, was recalled to active service with the rank of Lieutenant General with the title of Commander of the United States Armed Forces in the Far East. After the fall of the Soviet Union and the decline of the threat of communism in the 1990s, bilateral support for the Mutual Defense Treaty was a roller coaster; especially in the Philippines. In general, the Philippine government has remained positive about the treaty since its inception, often relying on the United States for its defense, as it has done since World War II. This was highlighted during the Cold War by the many US military bases active in the Philippines.
The most notable and controversial of these bases are Clark Air Force Base outside Metro Angeles City and U.S. Naval Base Subic Bay. The bases were garrisoned for nearly 40 years after the end of World War II until the early 1990s. In 1991, anti-American sentiment in the Philippines forced the Philippine Senate to reject a new treaty on the basic agreement, which then forced the withdrawal of all U.S. forces from Philippine soil.  However, given the rise of global terrorism with the events of 9/11 and China`s economic boom and militant expansion that followed, the United States strengthened its relations with its Asian allies, especially the Philippines.  From 1988 to 1992, the U.S. government and the Philippine government attempted to renegotiate the terms of an expansion of the Subic and Clark military bases. This meant the 1947 military base agreement, which was due to expire. Intensive negotiations between the governments of the United States and the Philippines have begun. These negotiations culminated in the Treaty of Amity, Peace and Cooperation between the United States and the Republic of the Philippines.
 This would have extended the lease of the US bases in the Philippines. A bone of contention, however, remained the amount of money the U.S. government would pay the Philippine government to rent and use the bases.  The Philippines became a colony of the United States after the Spanish-American War and the subsequent Philippine-American War. In 1935, under the Tydings-McDuffie Act, the Philippines became an autonomous Commonwealth, the Philippine Commonwealth, with full independence planned ten years later. Delayed by World War II and the Japanese invasion and occupation of the Philippines, the Philippines became fully independent on July 4, 1946.  After independence, there was a strong U.S. military presence in the Philippines, including a number of U.S. military bases in the Philippines, all of which were authorized by treaties between the newly independent Philippines and the United States.
There were also a number of treaties that created a strong bond between the Philippines and the United States, giving both countries rights that other nations did not enjoy. The Mutual Defense Treaty between the Republic of the Philippines and the United States of America was signed in Washington, D.C on August 30, 1951. between the representatives of the Philippines and the United States.  Cavite, which houses most of the Spanish fleet in the Philippines, suffered from unsanitary living conditions and was vulnerable in times of war and bad weather due to its shallow waters and lack of shelter. Therefore, in 1868, a military expedition was sent to Subic Bay with orders to survey the bay to find out if it would be a suitable place for a shipyard. The Spaniards explored the entire bay and concluded that it was promising and reported their cavite results. This report was not well received in Manila, as the Spanish command was reluctant to settle in the provincial isolation of Subic. Finally, in 1884, a royal decree declared Subic Bay a naval port. After the signing of the Manila Declaration, representatives of the United States and the Philippines met to sign a new partnership that strengthens economic and defensive ties between the two countries.
This new formal agreement is the Partnership for Growth. The new agreement is part of President Obama`s global development initiative, which aims to strengthen business development and trade relations between the Philippines between the two countries.  At the signing ceremony of this new agreement, Secretary of State Clinton reaffirmed the United States` position on the mutual defense of the Philippines, declaring: “The United States will always be in the philippines` corner. We will always be by your side and we will fight to achieve the future we are looking for. On March 8, 1885, the Spanish Navy approved the construction of the Olongapo Arsenal and work on the following September began in Olongapo. The port and its inner basin were dredged and a drainage channel was built as Spanish military authorities planned to turn Olongapo and its shipyard into an “island”. This canal also served as a line of defense and on which the bridge passes to the main gate of the base. .