I was given a book recently on the experiences of Marcus Lutrell of the US Navy, specifically, the Seal Team member of the US Navy.  He was wounded in Afghanistan and lost friends and comrades who fought to save him and accomplish their mission.  This was an excellent book which details what training the Seals undergo and the sheer will and determination it takes to become one of the most elite fighting groups in the world.  If you have ever know someone who has been through this training, you will better understand them as a person.  bw