The Last Detail (1973, Jack Nicholson, Otis Young, Randy Quaid)

A prisoner is escorted from Norfolk, Virginia on a Greyhound GMC MCI-7:
Prior to this we see an 'Old Look' identified by Roy Manning on the Internet Movie Cars Database as a GM TDH5105, noting it as in the livery of Virginia Transit. The scene was filmed at the US Navy base in Norfolk, Virginia, where a yellow schoolie is also glimpsed:
Also seen are a GMC MCI-5 and a 'New Look':