I am doing a presentation for a class in which I give as much background information as possible about a certain object. I inherited my great-grandfather's cap from world war two, and would love to present it as my item, but know NOTHING about it. It looks a lot like the one pictured, but a darker khaki shade and without ventilation holes. I would LOVE any historical information, such as where and by whom hats such as these were manufactured, how they were distributed to the men, what rank they signify, anything and everything that any of you may know. Any links, email addresses of experts, or forum links would also be appreciated. Thank you very much!