 In the fall of 1977, the building at 9005 Tudor Lane reopened as Osbourn High School, a four-year high school.The eagle was chosen to be the school mascot, and navy blue and silver gray became the school colors.Due to Manassas's rapid growth, Grace E. Metz Junior High School opened in 1990 and Osbourn became a three-year high school (grades 10-12).