He served as a member of the directing staff at the Staff College , Camberley , for two and a half years .
Having attended the National Defence College , Jackson joined the directing staff at the Army Staff College and was promoted to lieutenant colonel in 1981 .
Jackson served as a member of the directing staff at the Army Staff College       , for two and a half years .
Having attended the National Defence College , Jackson joined the directing staff at the Army Staff College and was promoted to lieutenant colonel in 1981 .