I don't lose any sleep at night over the potential for failure. I cannot even spell the word.

Fight with a happy heart and strong spirit.

A country that armed Stalin to defeat Hitler can certainly work alongside enemies of al-Qaida to defeat al-Qaida.

Be the hunter, not the hunted: Never allow your unit to be caught with its guard down.

There are hunters and there are victims. By your discipline...you will decide if you are a hunter or a victim.

General [James] Mattis's primary experience - indeed, his only experience - is as a member of the United States Marine Corps, where he served for 41 years. That's his experience.

ISIS is a threat to all civilized nations. America's intention is that the foreign fighters do not survive the fight to return home to North Africa, to Europe, to America, to Asia, to Africa. We're not going to allow them to do so. We're going to stop them there and take apart the caliphate.