'We're Always Faithful to One Another': Marine Donates Kidney to Fellow Marine

Two veterans will attempt to reach the summit of North America's highest mountain next month to raise money for an important cause.

Air Force veteran Katelyn Sheehan and retired Marine Corps Sgt. Kirstie Ennis will attempt to climb Mount Denali in Alaska to benefit nonprofit Building Homes for Heroes.

The organization builds or modifies mortgage-free homes for injured veterans and their families.

Ennis, who joined the Marines at age 17, lost her leg and sustained brain injuries in a helicopter crash in Afghanistan.

"It was an uphill battle," she said. "I lost that sense of purpose."

She said Building Homes for Heroes provided her with the "framework and foundation" to her future.

"We don't want pity. We want opportunity," she added.

Sheehan said that she's nervous for the climb, but that she's happy Ennis is by her side.

"It takes three kinds of stamina and one of them is mental, and we've got that," she said.

The duo will begin their ascent up Mount Denali on June 1.

Watch the segment from "Fox & Friends" above.

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