In July 1995, Windows NT 3.5 with Service Pack 3 was rated by the National Security Agency as complying with Trusted Computer System Evaluation Criteria (TCSEC) C2 criteria.
Pada bulan Juli 1995, Windows NT 3.5 dengan Service Pack 3 memiliki rating C2 oleh National Security Agency (NSA) dengan menggunakan pengujian TCSEC C2 Criteria.