chuck severson shows us christians around the world. >> tears of joy in fort hood, texas. soldiers of the last combat brigade to leave iraq got home just in time for christmas. others weren't so lucky. troops are leaving georgia this christmas eve for a new tour of duty in afghanistan. >> just how people support us, openly during the holiday season. we are away from our families. >> they will join tens of thousands of soldiers still fighting in afghanistan. some attended church service necessary could be he will. will -- it's sad being i away from my family but this is also my family. >> and the president remembers those. >> stand say a prayer for our perhaps all over the world, especially the brave men and women in after gran stan. >> and pope benedict xvi lit a candle in his window. a few hours later he celebrated the traditional christmas eve mass. . ♪ >> and more than 100,000 tour efforts and pilgrams backed bethlehem to celebrate the traditional christmas mass, the christmas nativity at the birthplace of jesus. chuck severson, abc news. >> he survived a bombing in afg