in the back of the book segment tonight, as you know, "the factor" has been on a mission to get our wounded veterans high-tech track chairs. here to tell us about the difference it can make in a wounded vet's life are two heroes who use them. marine sergeant jack pierce, injured severely in afghanistan and sergeant first class john rogers, injured in between combat tours. gentlemen, thank you for your service. we love you here at the "o'reily factor" and across the country. jack, start with you. first of all, take us back to january 9, 2010, in helmand province. >> we were doing a resupply convoy, insurgents had buried 400 pounds of sentec under the