Just after midnight on Christmas morning, U.S. Marines in Iraq sit inside a dining hall used as a chapel, while a Marine chaplain delivers a midnight religious service in celebration of Christmas. (AP Photo/Brennan Linsley)

British troops enjoy their Christmas meal complete with a traditional Christmas Box of gifts, inside the Basra Air Station military base, in Basra, Iraq. The troops, wearing their bright-red Santa hats, drank beer and pulled Christmas crackers as they celebrated Christmas far from home. The British Ministry of Defence (MoD) organised a Christmas box packed with gifts for every British serviceman. (AP photo / British Ministry of Defence/Cpl Pete Murray, HO)