In the initial callup, Hauser and his partner arrive after the gun thug had taken the girl hostage and went inside. Hauser never saw either of them, yet he gave an accurate description of the girl to the SWAT supervisor.
Holcombe by his radio designator of R80-David is clearly a supervisor, yet when he is seen in uniform, he has no rank insignia such as Sergeant chevrons or Lieutenant bars. In the LAPD, a unit designator of R10/20/30 etc. David holds the rank of Lieutenant.