Last year, I read Ed Macy's "Apache", the story of an attack helicopter pilot in Afghanistan, which is an exceptional book. I thought that "Immediate Response" would be very similar, albeit being about pilot who flies transport helicopters.
Yes, the subject matter is similar, but it is the difference in writing style that sets the two books apart, and "Immediate Response" suffers in the comparison. The main problem is the excessive use of jargon and abbreviations - I found the narrative difficult to follow as a result, and reading the book turns into hard work as a result. (And that's coming from someone with a technical background, a pilot's license, and who has flown helicopters himself.) There are too many occasions where jargon is used and not explained until several pages later, if at all, and as a result, the overall sense the reader is left with is confusion.
To someone with Forces experience, or similar, this is almost certainly a great read, but if you lack the relevant experience (as most readers will), "Apache" is far more approachable.