Washington ? This is one Christmas gift U.S. taxpayers don’t need.

Construction of a $30 million dining facility at a U.S. base in Iraq is scheduled to be completed Dec. 25. But the decision to build it was based on bad planning and botched paperwork. The project is too far along to stop, making the mess hall a future monument to the waste and inefficiency plaguing the war effort, according to an independent panel investigating contracting in Iraq and Afghanistan.

In its first report to Congress, the Wartime Contracting Commission presents a bleak assessment of how tens of billions of dollars have been spent since 2001. The 111-page report, obtained by The Associated Press, documents poor management, weak oversight, and a failure to learn from past mistakes as recurring themes in wartime contracting.

The report is scheduled to be made public Wednesday at a hearing held by the House Oversight and Government Reform’s national security subcommittee.

U.S. reliance on contractors has grown to “unprecedented proportions,” says the bipartisan commission, established by Congress last year. More than 240,000 private sector employees are supporting military operations in Iraq and Afghanistan. Thousands more work for the State Department and U.S. Agency for International Development.

But the government has no central database of who all these contractors are, what services they provide, and how much they’re paid. The Pentagon has failed to provide enough trained staff to watch over them, creating conditions for waste and corruption, the commission says.

In Iraq, the panel worries that as U.S. troops depart in larger numbers, there will be too few government eyes on the contractors left to oversee the closing of hundreds of bases and disposal of mountains of federal property.

At Rustamiyah, a seven-acre forward operating base turned over to the Iraqis in March, the military population plunged from 1,490 to 62 in just three months. During the same period, the contractor population dropped from 928 to 338, leaving more than five contractors for every service member.

In Afghanistan, where President Barack Obama has ordered a large increase of U.S. troops, existing bases will have to expand and new ones will be built — without proper oversight unless the Pentagon rapidly changes course.

One commander in Afghanistan told the commission he had no idea how many contractors were on and off his base on a daily basis. Another officer said he had property all over his installation but didn’t know who owned it or what kind of shape it was in.

There are questionable construction projects in Afghanistan, too. The commission visited the New Kabul Compound, a building intended to serve as headquarters for U.S. forces in Afghanistan. But members saw cracks in the structure, broken and leaking pipes, sinking sidewalks and other defects.

“The Army should not have accepted a building in such condition,” the report says.

The commission cites concerns with a massive support contract known as “LOGCAP” that provides troops with essential services, including housing, meals, mail delivery and laundry.

Despite the huge size and importance of the contract, the main program office managing the work for both Afghanistan and Iraq has only 13 government employees. For administrative help, it must rely on a contractor.

KBR Inc., the primary LOGCAP contractor in Iraq, has been paid nearly $32 billion since 2001. The commission says billions of dollars of that amount ended up wasted due to poorly defined work orders, inadequate oversight and contractor inefficiencies.

In one example, defense auditors challenged KBR after it billed the government for $100 million in costs for private security even though the contract prohibited the use of for-hire guards.

KBR has defended its performance and criticized the commission for making “biased” statements against the company.

“As we look back on what we’ve done, we’re real proud of being able to go into a war theater like that as a private contractor and support 200,000 troops,” William P. Utt, chairman of the Houston-based KBR, said in May.