Presidential guards preparing for the flag-raising ceremony as staff from the Prime Minister's Office and President's Office gathered for the National Day observance ceremony held at the Istana yesterday. Attendees - including President Tony Tan Keng Yam (centre, with red tie), flanked by Prime Minister Lee Hsien Loong and Deputy Prime Minister Tharman Shanmugaratnam - recited the Pledge, and sang the National Anthem and popular National Day theme songs. Dr Tan said in a Facebook post that the event was symbolic in commemorating Singapore's independence. "It is meaningful as we reflect on what we have done to get here and how we can continue to contribute to make our home and country a better place for all." Singaporeans will be celebrating the nation's 51st year of independence today.