While the front-line combat troops receive the lion's share of the coverage and credit in the war in Iraq, a critical and increasingly dangerous campaign to supply them is being waged behind the lines.
The ambush on Sunday of an Army maintenance company near Nasiriya illuminated the risks faced by the unglamorous but essential troops who carry food, fuel, water and ammunition to front-line troops.
The attack has raised questions about whether the force assembled to overthrow Saddam Hussein is not only large enough to accomplish its mission but also to protect its supply lines, which now run 482km north from Kuwait.
Senior commanders in Washington and at Central Command here insist that the 300,000 troops in and around Iraq are adequate for both jobs. But they are now also shifting the focus of the ground campaign away from Baghdad and back to the south, with the goal of defeating the fedayeen and other Iraqi irregulars who threaten supply columns.
Even before this change in tactics, the threat of hit-and-run attacks on supply routes and the 18,927-liter tanker trucks moving fuel to combat formations had forced field commanders to divert some troops to protect those units ferrying war-fighting material to the front.
Commanders had already beefed up protection around the supply convoys, which can stretch for kilometers. The fuel tankers make especially inviting targets, so supply lines had been patrolled by attack helicopters and cargo vehicles accompanied by Bradley fighting vehicles.
Experts in military logistics agree that the rapid multi-pronged advance toward Baghdad and the guerrilla activity behind the lines pose significant risks to the supply lines and the soldiers who must keep them open.
"You have your lines of communication extended, in some cases for hundreds of miles, and that makes this problem very, very difficult to manage," said General John Coburn, the retired head of the Army Materiel Command. "It's exacerbated by the environment and my guess is you've got shortages of parts, people repairing equipment right on the battlefield and constantly being forced to adapt to the combat commander's maneuver plan."
In addition, Coburn said, leaders of logistical units must handle growing numbers of prisoners of war and provide food and other aid to Iraqi civilians.
"When you look at this task, you have to start with the lines of communication and ask how much force is being dissipated in protecting them and how much risk is being taken," said Major General William Nash, a retired officer who commanded a brigade of the 3rd Armored Division during the Gulf War.
"Some amount of potential combat power is being used to protect and secure those supply lines," Nash said.
It is difficult to conceive the volume of supplies required for a large combat force or the difficulty of delivering them where they are needed in a timely fashion.
Fuel is a critical concern. The tank battalions, helicopter squadrons, attack aircraft, Marine maneuver units and warships in the Iraqi theater consume almost 57 million liters of fuel a day, according to Major General Dennis Jackson, director of logistics and engineering at Central Command headquarters here at Camp As Sayliya, outside the Qatari capital of Doha.
He said in an interview on the eve of the war that it was possible that the fast-moving forces could outrun their supply lines, limiting the speed of advance. The sandstorms and high winds in Iraq on Tuesday limited combat operations, while providing some relief to beleaguered supply officers, giving them a chance to refuel vehicles and move food, water, ammunition and medical supplies up the line.
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