新加坡总理：日本占领，留下沉重教训

Group 1 - The core message emphasizes the importance of self-defense and national sovereignty, particularly in the context of Singapore's history of occupation during World War II [1][2] - The commemoration of February 15 as Total Defence Day serves as a reminder of the lessons learned from the Japanese occupation, which lasted over three years and resulted in significant loss of life, particularly among the Chinese community in Singapore [2][3] - The Prime Minister highlights that national strength is derived not from population size but from the collective will and determination of the citizens to protect their homeland and way of life [1] Group 2 - The historical context of the Japanese occupation is marked by the establishment of the "Memorial for Victims of the Japanese Occupation" in 1967, which has led to the annual observance of memorial activities by the Singapore Chinese Chamber of Commerce for 59 years [3]