British speakers say mainly [sentry-phew-gle] when the adjective stands alone and is not followed by a noun: It's centrifugal, but they shift the main stress on to the first syllable [sen-trif-yougle] if the word comes before a noun: centrifugal force. The US pronunciation is [sen-trif-yer-gle].
The maple leaf is a traditional Canadian emblem. Red recalls Canadian lives lost during World War I. White stands for snow. Effective date: 15 February 1965.