I have a WWI Helmet that was supposedly my great-grandfathers, he served with the Americans in 1918 over in Europe and received a Purple Heart in 1966 by the Johnson Administration commemorating his service, but his helmet is a basic Brodie Helmet but it has a decent sized red blob in the helmet, could this represent his regiment or something?

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.