Wease: I've had to operate on two to three hours of sleep a night for days on, days on end, being mentally and physically exhausted, but having Marines depend on me to lead them, to guide them and do my job so that we can provide the fire support in Fallujah. Endurance is very important.
Donahue: To keep going when conditions are tough, when you're exhausted, when you're expended, you're injured, you feel you can't go on. It's because you look to your right and you look to your left, and those Marines on either side of you are going to depend upon you to continue to go.
Booker: I had a recruit once. He wanted to quit because he couldn't do anything right, and that recruit made it through recruit training because he listened to the one thing I told him, which was never quit nor give up.
Fuller: The Marine Corps is constantly pushing you and pushing you and pushing you until the point where you feel like you can't do it anymore, and you just want to give up and quit. But once you push through that, and then you take a look back and you realize: I just did that. It's the greatest feeling in the world.
Barikbin: It's more than just wanting to go forward; it's that you know that you have to, both for yourself, for your job, for your family, for your friends.
Donahue: That mental ability to drive on is what's made the Marine Corps successful for years and years.
Wease: The Marine Corps is going to put you through challenging times, whether it be peace-time training or even in combat. If you don't have mental, physical, and emotional endurance, you're not going to be able to accomplish your job.