Army Black Knights Authentic Speed Football Helmet. Perfect item for autographs and collectors. This full size Army Black Knights helmet is designed with extended mandible (jaw area) protection, a steel polyvinyl-coated face mask, chin strap, increased padding, an integrated facemask attachment system and elliptical air vents. NCAA Team name on back bumper. The officially licensed Army helmet is great for autographs and features Army Black Knights team logo decals on both sides. The striking shape of the future. NCAA Army Black Knights Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NCAA Army Black Knights Full Size Helmet.