That is real. I spent a career in the Air Force, and have seen/handled literally thousands of those. Just because of the sheer numbers produced/distributed, there's not much value, unless you can find one in MINT condition with the packaging and sharpening stone..... then they are worth a couple hundred dollars in certain circles of collectors.
They were not much copied, simply because it's a rather poor design, who's best use was as a hammer (the buttcap). The blades were/are notoriously soft, and were/are more often used as a digging tool versus a cutting implement. The military contract made the company, because at the time, Ontario was the only bid for the contract, and remained so for at least 3 decades to my knowledge.