Reporters from CNN world news interviewed many of the sentenals after the hurricane and discovered that they continued to walk their post. 

Tom Brokaw of NBC News saluted "this display of pride and patriotism," reporting that "those who guard the Tomb of the Unknowns at Arlington National Cemetery were told they could abandon their 24-hour-a-day post and come indoors, they refused."
Web. 27 Oct. 2010. http://www.arlingtoncemetery.net/stood-their-post.htm.