What is the author's style in Delta Force by Charlie A. Beckwith?

The perspective of the author is quite discernible. In this case, this is apt to be a good thing, as he does not pretend to write the impartiality of a calibrating scale but presents himself as a real man with a sense of worldly sensibility about the entire matter. He describes himself as "an emotional man" more than once during the book. Again, this isn't necessarily wrong, but when his feelings are bad, they are more likely to cause a problem. When he cares and is helpful, protective and warm-hearted whether to his colleague, relatives, or friends, then he expresses his feelings and they are perceived as great, rather than troubling.