File:Guyinventions helmetgun.jpg

Appears to have been copied from the Gizmondo article Head-Mounted Gun Patent Blows Minds, Literally - direct image link https://i.kinja-img.com/gawker-media/image/upload/18s0hk4wb27dujpg.jpg

Gizmondo indicates that the image comes from a 1963 patent 'Albert's Helmet-Mounted Pistol'. The United States Patent and Trademark Office states that "Not all materials on the USPTO website are works of the U.S. government", so this image is not necessarily in the public domain despite possibly being from a US government website.