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Attacks like these -- or U.S. awareness of them -- appear to have escalated in the past six months, said one former official briefed on the matter.

while the spies were able to download sizable amounts of data related to the jet-fighter, they weren't able to access the most sensitive material, which is stored on computers not connected to the Internet.

The Joint Strike Fighter, also known as the F-35 Lightning II, is the costliest and most technically challenging weapons program the Pentagon has ever attempted. The plane, led by Lockheed Martin Corp.

A Pentagon report issued last month said that the Chinese military has made "steady progress" in developing online-warfare techniques. China hopes its computer skills can help it compensate for an underdeveloped military, the report said.

The Chinese Embassy said in a statement that China "opposes and forbids all forms of cyber crimes." It called the Pentagon's report "a product of the Cold War mentality" and said the allegations of cyber espionage are "intentionally fabricated to fan up China threat sensations."

The U.S. has no single government or military office responsible for cyber security. The Obama administration is likely to soon propose creating a senior White House computer-security post to coordinate policy and a new military command that would take the lead in protecting key computer networks from intrusions, according to senior officials.

The Bush administration planned to spend about $17 billion over several years on a new online-security initiative and the Obama administration has indicated it could expand on that.

Former U.S. officials say the attacks appear to have originated in China. However it can be extremely difficult to determine the true origin because it is easy to mask identities online.

Six current and former officials familiar with the matter confirmed that the fighter program had been repeatedly broken into. The Air Force has launched an investigation.

Foreign allies are helping develop the aircraft, which opens up other avenues of attack for spies online. At least one breach appears to have occurred in Turkey and another country that is a U.S. ally, according to people familiar with the matter.

Joint Strike Fighter test aircraft are already flying, and money to build the jet is included in the Pentagon's budget for this year and next.

Computer systems involved with the program appear to have been infiltrated at least as far back as 2007, according to people familiar with the matter. Evidence of penetrations continued to be discovered at least into 2008. The intruders appear to have been interested in data about the design of the plane, its performance statistics and its electronic systems, former officials said.

The intruders compromised the system responsible for diagnosing a plane's maintenance problems during flight, according to officials familiar with the matter. However, the plane's most vital systems -- such as flight controls and sensors -- are physically isolated from the publicly accessible Internet, they said.

The intruders entered through vulnerabilities in the networks of two or three contractors helping to build the high-tech fighter jet, according to people who have been briefed on the matter. Lockheed Martin is the lead contractor on the program, and Northrop Grumman Corp. and BAE Systems PLC also play major roles in its development.

The spies inserted technology that encrypts the data as it's being stolen; as a result, investigators can't tell exactly what data has been taken. A former Pentagon official said the military carried out a thorough cleanup.

Investigators traced the penetrations back with a "high level of certainty" to known Chinese Internet protocol, or IP, addresses and digital fingerprints that had been used for attacks in the past, said a person briefed on the matter.

As for the intrusion into the Air Force's air-traffic control systems, three current and former officials familiar with the incident said it occurred in recent months. It alarmed U.S. national security officials, particularly at the National Security Agency, because the access the spies gained could have allowed them to interfere with the system, said one former official. The danger is that intruders might find weaknesses that could be exploited to confuse or damage U.S. military craft.

In his speech in Austin, Mr. Brenner, the U.S. counterintelligence chief, issued a veiled warning about threats to air traffic in the context of Chinese infiltration of U.S. networks. He spoke of his concerns about the vulnerability of U.S. air traffic control systems to cyber infiltration, adding "our networks are being mapped." He went on to warn of a potential situation where "a fighter pilot can't trust his radar."

Local giants Lockheed Martin and General Dynamics also run substantial government-support operations and would see some weapons projects cut, while other programs would receive budget increases.

In particular, the proposed budget would sharply reduce the number of contractors who help the Pentagon oversee and manage its vast weapons-buying apparatus following a string of reports chronicling cost overruns and other problems.

A CACI executive said the company is waiting for further details before commenting. The Arlington company has 12,300 employees, half of whom are in the D.C. region. Ninety-five percent of its $2.4 billion in revenue last year came from federal contracts for technical services and information technology and contracting oversight for the Army and Navy, as well as such Pentagon offices as the Defense Advanced Research Projects Agency and the Missile Defense Agency.

Overall, the budget Gates proposed calls for major cuts to the weapons programs of some of the largest contractors.

One of the hardest-hit defense firms was Boeing. The Chicago company's $150 billion Future Combat Systems, a family of Army vehicles linked by high-tech communications, came under criticism from Gates for being costly and plagued by development problems. He proposed canceling the $87 billion vehicle part of the system -- a move that would hurt Boeing, SAIC and their subcontractors, BAE and General Dynamics.

Gates also proposed canceling some of Boeing's missile defense programs, including one to equip a modified 747 aircraft with a laser that can shoot down missiles soon after they're launched, saying the program "has significant affordability and technology problems and the program's proposed operational role is highly questionable."

Boeing would also be hurt because it makes one-third of the F-22 fighter jet and the Pentagon plans to stop ordering additional aircraft. Gates would also cancel the Air Force's program to build a new search-and-rescue helicopter, which had been awarded to Boeing. And it would not order more of Boeing's C-17 cargo planes. Boeing could also see a military satellite program, known as TSAT, end.

Lockheed Martin, of Bethesda, the biggest defense contractor in the world, also took hits on several of its major programs.

Gates said he would kill the company's bid to build the presidential helicopter, known as the VH-71, citing the fact that the program is six years late and has gone from initial estimates of $6 billion to $13 billion.

Lockheed was also hit by the move to not order more F-22 fighter jets. Perhaps hoping for support in Congress, the company has taken out newspaper ads explaining how its F-22 supports roughly 25,000 jobs around the country.

But the Pentagon proposed ordering more of Lockheed's F-35 known as the Joint Strike Fighter, and it would increase from two to three the number of littoral combat ships being built by Lockheed and General Dynamics to patrol near enemy coastlines.