But as the Defense Department hits its year-end goal of delivering 1,500 heavily armored, V-hulled "mine-resistant ambush-protected" trucks to Iraq, the feeling in the Pentagon is far from elation. Instead, an intense debate has broken out over whether the vehicle that is saving lives also could undermine one of the most important lessons of the whole war: how to counter an insurgency.
Though offering needed armor, the MRAP lacks the agility vital to urban warfare. "It's very heavy; it's relatively large; it's not as maneuverable as you'd like it to be," Gen. William S. Wallace, the officer in charge of Army doctrine and training, said recently. "All of those things should be of concern."
But with nearly 12,000 of the trucks on order in a program that has a projected cost of more than $17 billion, the MRAP -- the most expensive new Army weapons system acquired since the Sept. 11 attacks -- is likely to influence how the Army fights future wars.
Geoff Morrell, the Pentagon press secretary, said MRAPs are an important part of the military's response to the needs of U.S. soldiers in Iraq.
"There is never one silver-bullet solution for all the problems you find in war," Morrell said. "The key is to find a combination of things that address the problems."
Support for MRAPs within the Pentagon has weakened recently, in part because of the decline in military casualties in Iraq. With roadside bombings diminishing, the military services worry that they will be saddled in the near future with thousands of large, heavy, expensive trucks that they will no longer need.
But more fundamentally, the MRAP has reignited a debate that has bedeviled strategists since the war began: Is the best way to save soldiers' lives to give them tools to survive attacks, or to prevent the attacks?
On one side of the argument are senior officials in Washington, including Defense Secretary Robert M. Gates and Senate Foreign Relations Committee Chairman Joseph R. Biden Jr. (D-Del.), who have insisted that MRAPs are a moral imperative, needed to protect vulnerable soldiers from death and dismemberment.
But a growing number of counterinsurgency experts, prodded by an October report by influential Pentagon consultant Andrew F. Krepinevich Jr., have argued that the hulking vehicles are antithetical to fighting a guerrilla war.
Guerrilla warfare, or counterinsurgency, requires soldiers to mingle with Iraqi citizens -- a task that has been at the center of the strategy implemented by Army Gen. David H. Petraeus, the Iraq war commander.
"You've got Dave Petraeus telling his people 'Get out and walk,' because the long-term solution to reducing our casualties is . . . getting to know the people, providing security in the neighborhood," Krepinevich said in an interview. "In a sense, you've got two competing priorities."
Gates rushes MRAPs in
The decision to make MRAPs the Pentagon's top wartime procurement priority was one of Gates' first decisions as Defense secretary. Occasionally frustrated with the department's inability to move quickly, Gates ordered MRAPs flown to Iraq in scarce cargo planes in an unprecedented logistical effort.
"There was a moral imperative to provide a better way to protect soldiers," said Lt. Gen. Stephen M. Speakes, the Army general in charge of procurement programs. "That was the driving factor that united all of us in a realization we had to do something different. Soldier protection was Job One."
Pentagon spokesman Morrell said: "There are tradeoffs. You can't build a vehicle as protective as this one is without trading off the ability to connect more directly with the population."
Gates' championing of MRAPs made emerging doubts about the program all the more remarkable, since they mark one of the first times the uniformed military has publicly pushed back against the popular Defense secretary.
Earlier this month, Marine Corps officials announced they were cutting the number of MRAPs they intended to buy, to 2,300 from 3,600, citing the reduced violence in Iraq and the questionable utility of the vehicles in other missions.
Army officials, who were planning the largest purchases, are considering a similar move.