Online here (so read it!)
Military SF although with a more human bent. The titular character is a cyborgised marine, also known as ‘The Petty Officer’, very much in the Halo Master Chief mould. The protagonist is a private who is transferred to the Petty Officer’s squad, who is very much aware that whilst it is a recognition of his own skills, it is essentially a short term posting in his military career, and indeed, it will be his final posting – life expectancy of squad members is little more than a couple of missions.
And this is where the story gets interesting, as the private finds out more about The Petty Officer over a number of missions, and then it gets very queer….