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People came out in the thousands for the first-ever USA Half Marathon Invitational in San Diego. Some sporting red, white and blue, others celebrating the miles with their friends, runners made the 13.1-mile loop from downtown San Diego to Waterfront Park, covering some of the more eclectic areas of the city. And no surprise here–the weather was near perfect! Check out these photos from some speedy age-group runners! Photos courtesy of the USA Half Marathon