Bush Holds Firm on Iraq as War Enters Sixth Year  On the fifth
anniversary of the start of the Iraq war, President Bush
acknowledged Wednesday that there is "understandable debate"
over the conflict. But the president said he would reject any
additional troop withdrawals that could jeopardize security on
the ground.  Speaking at the Pentagon to the military's top
brass, soldiers and diplomats, Bush said increasing the pace of
withdrawal could be a setback to progress made since the so-
called "surge" — an infusion of 30,000 additional troops last
year.  "Having come so far and achieved so much, we are not
going to let this happen," he said, referring to a wider troop
drawdown.  The president admitted that "there's an
understandable debate over whether the war was worth fighting,
whether the fight is worth winning, and whether we can win it.
The speech to a largely sympathetic audience marked the fifth
anniversary of the U.S.-led invasion of Iraq, a conflict that
has lasted much longer and cost more lives tha