On 18 August 2015, to commemorate Singapore's 50 years of nation-building, the Monetary Authority of Singapore launched a set of six commemorative notes. These commemorative notes comprise five S$10 polymer notes and a S$50 note. The note design's draw inspiration from significant milestones and achievements in Singapore's history, the multiracialism that defines the nation and the values and aspirations that underpin Singapore's progress. The front of both the $50 and $10 notes feature a portrait of Yusof Ishak, Singapore's first president, as in the current Portrait series notes. The $50 note highlights Singapore's history, transformation and future. It shows the late Prime Minister of Singapore, Lee Kuan Yew, shouting "Merdeka!"—the rallying cry of Singapore's independence struggle. The note makes distinctive use of the colour gold, reflecting Singapore's Golden Jubilee. The five $10 notes have a common front design and varying back designs depicting the theme 'Vibrant Nation, Endearing Home'. Each note reflects a value or aspiration that defines the theme: 'Caring Community, Active Citizenry', 'Opportunities for All', 'Safe and Secure', 'Strong Families' and '...regardless of race, language or religion...'.