Melbourne University Royals Gridiron Club player on field, location unknown, 2 September 2019. View public domain image… https://www.rawpixel.com/image/6113631/photo-image-face-mask-public-domain-shapeFree Image from public domain licenseAmerican football players on field, location unknown, 1 March 2017. View public domain image source here https://www.rawpixel.com/image/6113577/photo-image-public-domain-blue-greenFree Image from public domain license