If you head down County Road J, just outside of Hammond, Wisconsin, you'll find something not for the squeamish.

That would be Skydive Twin Cities.

About 100 people a day jump from 13,000 feet to feel the exhilaration. Keith and Ken Hersey are here to do just that.

They're one of a kind, really.

"This is a celebration of our 70th birthday. We're twins," said Ken.

Twin brothers celebrating a birthday in a free fall, with much of the family looking on. Their wives didn't seem to worried.

"I'm very excited for him, he's wanted to do this all his life," said Ginny Hersey.

"He came up with the idea, he thought it would be great and we went along with it," said Marion Hersey.

After some instructions about safety, it was time to suit up and climb aboard.

Keith and Ken are actually doing this for another reason too.

"We had a cousin who lost his son a few days ago," said Ken. "He died of leukemia."

"Today was supposed to be his wedding day," said Keith. "It's not going to be a happy day for the family. I just hope we can do something to remember them."

Two retired twin brothers jumping from an airplane, for a special memory in more ways than one.

And after the jump, Keith and Ken said they would skydive again, and again.