McKinney Marshals Select Baseball The McKinney Marshals Select Baseball Program fields teams ages 18U, 17U, 16U, 15U, 14U, 13U, 12U, 11U, 10U, 9U, 8U. One of the most successful select baseball development programs in the country, the Marshals organization was founded in 2004. The Marshals will be launching a revamped program in July 2010. Tryouts will begin in July 2010 for Fall 2010 teams, and tryouts will be scheduled in late Fall 2010 for Spring/Summer 2011 teams in all age groups. The McKinney Marshals Select Program is des Mckinneymarshals.com~Site InfoWhoisTrace RouteRBL Check