Trust me, after reading Combat Camera, you will know just how ignorant you are of the war in Afghanistan. It won't resolve your conflict over the purpose of it, but it will help you better understand its cost. More importantly, it will broaden your appreciation for the scope of the potential tragedy yet to come. Even now, I am looking more closely at news reports, as well as official government statements, and seeing the voids in them.
On a more practical note, Combat Camera is competently written and published without the sorts of flaws that fill too many books these days. You will be able to follow Christian's journey from cover to cover without distraction from speed bumps such as grammatical and spelling errors. I find it sad that I must include that observation inasmuch as too many books published these days are so badly flawed by these things. Although my fellow Americans may find a few challenges with the British idiom and slang, these are more endearing than annoying. A few hours watching BBC America programming should prepare them for the experience.