Here is an excerpt:
I am sorry that it has come to this.
The fact is, for as long as I can remember my motivation for getting up every day has been so that you would not have to bury me. As things have continued to get worse, it has become clear that this alone is not a sufficient reason to carry on. The fact is, I am not getting better, I am not going to get better, and I will most certainly deteriorate further as time goes on. From a logical standpoint, it is better to simply end things quickly and let any repercussions from that play out in the short term than to drag things out into the long term.
You will perhaps be sad for a time, but over time you will forget and begin to carry on. Far better that than to inflict my growing misery upon you for years and decades to come, dragging you down with me. It is because I love you that I can not do this to you. You will come to see that it is a far better thing as one day after another passes during which you do not have to worry about me or even give me a second thought. You will find that your world is better without me in it.
I really have been trying to hang on, for more than a decade now. Each day has been a testament to the extent to which I cared, suffering unspeakable horror as quietly as possible so that you could feel as though I was still here for you. In truth, I was nothing more than a prop, filling space so that my absence would not be noted. In truth, I have already been absent for a long, long time.
My body has become nothing but a cage, a source of pain and constant problems. The illness I have has caused me pain that not even the strongest medicines could dull, and there is no cure. All day, every day a screaming agony in every nerve ending in my body. It is nothing short of torture. My mind is a wasteland, filled with visions of incredible horror, unceasing depression, and crippling anxiety, even with all of the medications the doctors dare give. Simple things that everyone else takes for granted are nearly impossible for me. I can not laugh or cry. I can barely leave the house. I derive no pleasure from any activity. Everything simply comes down to passing time until I can sleep again. Now, to sleep forever seems to be the most merciful thing.
You must not blame yourself. The simple truth is this: During my first deployment, I was made to participate in things, the enormity of which is hard to describe. War crimes, crimes against humanity. Though I did not participate willingly, and made what I thought was my best effort to stop these events, there are some things that a person simply can not come back from. I take some pride in that, actually, as to move on in life after being part of such a thing would be the mark of a sociopath in my mind. These things go far beyond what most are even aware of.