DRAMA 8. 5 0PM, T E N They had me at “Taye Diggs guest stars”, but tonight’s episode belongs to Mark Harmon’s Gibbs. Diggs (right) plays PTSDsuffering Special Ops sniper Aaron Davis, whose stolen prototype rifle is being used in a series of attacks. Fellow former sniper Gibbs has to get back into his wartime headspace to bond with Davis and help solve the case. Fans will enjoy this one.