On 23 February 1945, a combined force of US paratroopers, Filipino guerrillas, and amphibious troops launched a raid on a Japanese internment camp at what is now the UPLB campus, freeing 2,147 Allied civilian and military prisoners — mostly American, British, and European civilians who had been interned since the Japanese occupation in 1942.
A memorial on the UPLB campus marks the site of the original internment camp. The raid is remembered as a remarkable feat of coordination and courage, and the anniversary is marked each February at the campus. The Raid on Los Baños has been the subject of several books and a documentary, and is a significant episode in the history of the Pacific War in the Philippines.