From Four Nodes of History: The Human Rights Challenge in the Philippine Security Sector
The Bataan Death March, 1942
The US army had also carried out massive construction of military defenses, and naval and air bases up to the mid 1930s.
These included naval defenses in Manila Bay, Fort Mills in
Corregidor, Grande Islands in Subic Bay, and Sangley Point in
Cavite, the home base of the US Asiatic Fleet. They built air
bases that included the Nichols Air Station (now Villamor Air
Base), Nielson Air Base (whose landing strips are now Ayala
and Buendia Ave.), Fort Stotsenburg (which became Clark
Air Base), and air fields in Tuguegarao, Aparri, Isabela, Nueva
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Ecija, Legaspi, Bataan and Del Monte in Davao. They also built
a string of military army camps in Fort McKinley (which became Fort Bonifacio), Camp Murphy (now Camps Aguinaldo
and Crame), Camp O’Donnell in Tarlac, Camp Wallace in La
Union, Camp Keitley in Lanao, Camp Eldridge in Los Banos,
Laguna, and Camp Henry T. Allen in Baguio City.
There was also the presence of allied naval forces in Southeast Asia that they could coordinate with if attacked by Japan.