All of Brendan Brustad’s friends think he is insane for what he is about to do.

“They think I am crazy but a lot more people are worried,” said the 26-year-old Air Force staff sergeant. “All of the crazy stuff I do, I do for the (bombing) memorial.”

On Sunday during the Oklahoma City Memorial Marathon, Brustad will run the half-marathon in his Air Force uniform, including boots, carrying a 168-pound pack on his back in memory of the 168 lives lost in the 1995 bombing of the Alfred P. Murrah Federal Building.

And that’s not all. Beginning Tuesday, Brustad will begin a quest to break 19 world endurance records by Sunday in memory of the 19 children who perished in the bombing.