The Bible is the handbook for life. Even if you don't believe in God or are a Christian, it holds many life truths that are the same for everyone, such as "Do not murder." In addition, it has many descriptions of battles, some of which are still studied at West Point for tactics.
Scientifically, it has much to offer. The Bible says the earth is round, and this was when the Catholic church still believed the earth was flat. This is just one example.
It tells of battlefield exploits, sexual adventure, daring leaders, and rebellions. Even if you just read it for the stories, it's a great book.
EDIT: And if you want something more war related, I suggest The Art of War by Sun Tzu, one of the best military masterminds to ever walk this earth. It is full of advice which can be applied to daily life. If you plan on going into military tactics or some such field, this will likely be required reading.
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