Wounded U.S. veteran in Antarctica: Team banding together during uphill trek

Wounded servicemen and women from the U.S., U.K., Canada and Australia are competing in the 208-mile Walking with the Wounded South Pole Allied Challenge. The charity race in Antarctica aims to raise money and awareness for disabled veterans transitioning back to civilian life.

Members of the U.S. team are filing voice blogs for CBSNews.com. Below is a dispatch from Army Capt. Ivan Castro, who was wounded by mortar shells during Operation Iraqi Freedom:

Today I'm sharing a tent with  Mr. Ed Parker, who takes very good care of me. We covered 17 kilometers today, and it seems like it has been all uphill. We only have 47 kilometers left to reach the South Pole, so we're all excited.

The pain: feet, back, shoulders - everybody has pushed themselves really hard, but it's well worth it.

Stay tuned, and hopefully the next time I speak to you, we'll be at the South Pole. Thank you for the support.