The photograph at the end of the memorial video shows three S.W.A.T. officers: Dennis Leski as Jack Luca on the left, Michael O'Neill as Carl Luca on the right, and in the center is Steve Forrest, in his role as Lieutenant Dan "Hondo" Harrelson in the original S.W.A.T. (1975).
After the drive by in the opening, there are people with CSI on their jackets. LA doesn't have CSI techs, they have SID techs ( Scientific Investigations Division)
Michael Beach, Hondo's childhood friend Leroy, & Michael O'Neill, as Carl Luca (Dominique Luca's father), also co-starred with Shemar Moore in 2 separate Season 3 episodes of Criminal Minds (2005). Michael Beach played Father Marks in Lucky (2007), & Michael O'Neill played Det. Yarbough in About Face (2007).