BAGHDAD, Iraq -- A brigade of fresh U.S. troops arriving in Baghdad will push the total U.S. troop presence in the Iraqi capital to around 40,000 by Monday, as planners prepare for the coming assault on insurgent hotspots to the west and the Iraqi elections in January. Army units that were slated to depart are being held back until after the elections, causing the overall number of U.S. troops in Iraq to swell to around 142,000, the highest level since the summer of 2003. At Camp Victory North, the sprawling headquarters of the Army's 1st Cavalry Division, the mess hall...