Before he became one of the most explosive receivers in franchise history, Roy Green  was grinding it out as a defensive back, trying to find his footing in the NFL. Drafted in the fourth round by the St. Louis Cardinals in 1979 as a DB, Green quickly earned the nickname “Jet Stream” for his blazing speed. But speed alone didn’t prepare him for the physical toll of double duty. By 1981, Green was playing meaningful snaps on both sides of the ball — covering receivers one seri