The Japanese air force's Blue Impulse aerobatics team is set to trace five Olympic rings in the sky with colored smoke on the day the Tokyo Olympics open next month, officials familiar with the planning said Monday.The team's jets are expected to perform a flyover in the skies around the capital's National Stadium, where the Olympic opening ceremony will be held on July 23, making circular smoke trails in blue, yellow, black, green and red.Blue Impulse, based at the Air Self-Defense Force Matsushima base in Higashimatsushima, Miyagi Prefecture, in northeastern Japan, gave similar performanc…READ FULL ARTICLE