Just finished reading "The Heart and the Fist" by Eric Greitens.
Eric Greitens, a young college student at the time, wanted to help in the humanitarian effort in impoverished countries. He traveled to many third world countries to help in the humanitarian effort, and it made him realize that you can't cure the worlds problem by just having humanitarians that have 'hearts'. You need Strong Men to stand up and fight the causes of these problems. So he became a Seal Officer to 'fight' back.
Great book that shows, as Greitens mentions on the dust jacket, "sometimes you have to be strong to do good, but you also have to do good to be strong".