CAMP UDARI, Northern Kuwait - The troops, tanks and armored equipment once seen as opening a crucial northern front against Baghdad are now pouring into Kuwait at a rapid pace with some elements preparing to head toward the Iraqi capital. Almost overnight troops from the 4th Infantry Division have flooded this dusty outpost, swelling chow-hall lines so much the Army built several new dining halls in the past two days. Those reinforcements could add a much-needed punch to the 3rd Infantry Division that is poised just a few scant miles from Baghdad. By month's end, the 4th will unload...