San Marcelino Airfield was built before the war by the Americans. On the morning of 29 January 1945 nearly 35,000 U.S. troops landed just northwest of San Marcelino. Elements of the US 38th Division immediately dashed inland to take the airstrip, but found that Filipino guerrillas under the command of Capt. Ramon Magsaysay, later president of the Republic of the Philippines, had secured the field three days earlier.
After the liberation by combined Filipino-American troops on Zambales in 1945, it was developed into a Fifth Air Force command facility as well as an operational airfield. With the end of the war, the airfield was closed and is now part of the town of San Marcelino. Units assigned were:
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