ABOARD USS THEODORE ROOSEVELT, EASTERN MEDITERRANEAN It was Friday evening and Rabbi Maurice Kaprow, deputy chaplain of the US Navy's Sixth Fleet, led a small congregation aboard this aircraft carrier in a Kabbalat Shabbat service. As we reached the verse in "Lecha Dodi" translated as "whose shelter of peace is spread over us," a jet returning from an operation in northern Iraq slammed down on the flight deck above us, sending a rumble through the chapel. Kaprow, a Conservative rabbi from Florida, had just arrived aboard for a three-week stint during which he plans to hold Shabbat services, Friday night...