These came in many variations over the years.
Sculptor:
Jes Goodwin
Painter:
Dale Hurst
Released in April 1989 as a boxed set with a Captain, a Librarian and 6 Marines, there were 3 Trooper body styles
Painted as White Scars, shown in WD118 October 1989
Released in January 1995 as a box of 4 Troopers and a Sergeant