Joe Otterson TV Reporter“NCIS,” “Bull,” “SWAT,” “Blue Bloods,” and ‘Magnum PI’ have all been renewed at CBS.The network made the announcement on Thursday on Twitter. That will mean a Season 19 for “NCIS,” Season 6 for “Bull,” Season 5 for “SWAT,” Season 12 for “Blue Bloods,” and Season 4 for “Magnum PI.” All four shows are produced by CBS Studios, with “SWAT” being a co-production with Sony Pictures Television.“NCIS” stars Mark Harmon, Sean Murray, Emily Wickersham, Wilmer Valderrama, Maria Bello, Brian Dietzen, and Diona Reasonover.