From google, not my brain.
John Hay Air Station was established on October 25, 1903 after President Theodore Roosevelt signed an executive order setting aside land in Benguet for a military reservation under the United States Army. The reservation was named after Roosevelt's Secretary of State, John Milton Hay.
Yep, it’s in Baguio City, one of the cooler places. It’s up in the mountains, so is nice. Most people assume the entire Philippines is hot and sticky EVERY day. Such is not the case. There are many areas higher up, that are quite cool and comfortable.