Chris Ryan has the 'Alpha Force' and 'Agent 21' series, I haven't read any of the Alpha Force books, but Agent 21 was quite good. 'Department 19' by Will Hill is a book popular with teens about a secret military organization fighting vampires.
There are a lot of books and graphic novels based on popular video games out there - I haven't read any of them myself so can't vouch for their quality, but maybe some of them would interest your son if he is in to gaming?
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