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An active duty Marine ran seven marathons on seven continents in just seven days to honor fallen soldiers.

The World Marathon Challenge took U.S. Marine Corps Captain Daniel Cartica on an amazing journey to Union Glacier, Antarctica; Punta Arenas, Chile; Miami, Florida; Madrid, Spain; Marrakech, Morocco; Dubai, the United Arab Emirates; and Sydney, Australia.

Not only did Cartica complete the grueling challenge, he did it in world-record time, averaging around three hours, 33 minutes per marathon, with an event best of 3:12:46 in Chile.

On "Happening Now" today, Cartica explained that he decided to enter the challenge to honor the four Marines and sailor who were killed in July when a gunman attacked a U.S. Naval Reserve Center and a Marine recruitment center in Chattanooga, Tennessee.

"I did not want the sacrifice of these ultimate warriors to be forgotten," Cartica said. "And if I could do a small part helping this country remember those servicemen, I would do the best I could."

Now part of a club more exclusive than than those who have voyaged into space or scaled Mount Everest, Cartica has his eyes set on even bigger goals.

He revealed that he would like to embark on a 50-50-50 endeavor (50 Ironman races in 50 States in 50 Days) as a way to continue to raise awareness for first responders and military veterans.

Watch more from "Happening Now" above.

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