I've listened to the audible version of his book, Extreme Ownership. It's great information where he and the co author read their own parts. They integrate their time as SEALS by creating solutions for not just combat but for average Joe's in the workplace. Basically by taking Extreme Ownership of everything you do and not making excuses you can become a better leader, husband, father, etc. I really liked the part of checking your ego. Being in law enforcement I'm used to being in charge of what I'm doing and having people listen intently on what I have to say. Now bringing that mentality into my house is a recipe for disaster. I have to check my ego, humble myself, and remember that at home my wife is my "partner" and we are a team. Also discipline equals freedom. If you are disciplined in what you do it leads to a better life. Examples would be being disciplined about fitness, finances, getting up early, not procrastinating, etc. By being disciplined you reap the benefits of being healthier, having financial wealth, enjoying the rest of your day, etc.
After hearing his book I went on to listen to one by David Goggins called "Can't Hurt Me." That's another excellent book / audiobook by a SEAL/Army Ranger.
Very motivational stuff. When I feel lazy I listen to them while I'm at my office or driving around.