It turns out that Riley is peripherally involved in the SCA and has been to a fighter practice. Details are sketchy, but it appears that he may have just recently discovered the SCA before leaving for the Iraq deployment. Master Henry Best, OP, says, "I spoke with an old friend of mine, Baron Conrade du Montgomerie, the Baron of Citadel, which includes Fort Bliss, Texas. He says that Sgt. Riley showed up as a visitor at one and only one fighter practice, perhaps two or three months ago. He speculates that Riley's unit may have deployed shortly afterwards." Fort Bliss, Texas, is the area where Riley's unit was stationed prior to deployment.
Riley's unit, the 507th Maintenance Company, took a wrong turn in Iraq, and they were captured by Iraqi militia on March 23. He is among the POWs rescued from captivity, with the help of a surrendering Iraqi soldier, on April 13.
[Editor's note: Thanks to Master Henry for permission to quote hist post to a Pelican mailing list, and thanks to Mistress Selene for the link to the updated article on CNN.com.]