A mechanical monster grabs the F-14 fighter jet and chews through one wing and then another, ripping off the Tomcat's appendages before moving onto its guts. Finally, all that is left is a pile of shredded rubble.

The Pentagon is paying a contractor at least $900,000 to destroy old F-14s, a jet affectionately nicknamed "the turkey," rather than sell the spares at the risk of their falling into the wrong hands, including Iran's.

Within a workday, a $38 million fighter jet that once soared as a showpiece of U.S. airpower can be destroyed at the Davis-Monthan Air Force Base in Tucson, Ariz., the military's "boneyard" for retired aircraft.

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"There were things getting to the bad guys, so to speak," said Tim Shocklee, founder and executive vice president of TRI-Rinse Inc. in St. Louis. "And one of the ways to make sure that no one will ever use an F-14 again is to cut them into little 2-by-2-foot bits."

The Defense Department had intended to destroy spare parts unique to the F-14 but sell thousands of others that could be used on other aircraft. It suspended sales of all Tomcat parts after The Associated Press reported in January that buyers for Iran, China and other countries had exploited gaps in surplus-sale security to acquire sensitive U.S. military gear, including F-14 parts.

Among other tactics, middlemen for the countries misrepresented themselves to gain access to the Defense Department's surplus sales or bought sensitive surplus from U.S. companies that had acquired it from Pentagon auctions and were not supposed to allow its export.

Investigators also found some sensitive items accidentally slipping into surplus auctions rather than being destroyed as they were supposed to be. In an unusual move when dealing with retired aircraft, the Pentagon is trying to shut off all avenues for Iran's parts purchasers by demolishing the F-14s, then combing through the scraps to make sure nothing useful remains.

Iran is the only country trying to keep Tomcats airworthy. The United States let Iran buy the F-14s in the 1970s when it was an ally, long before President George W. Bush named it part of an "axis of evil."

Shocklee's company won a three-year, $3.7 million contract to render surplus equipment useless for military purposes. The work includes the recent demolition of 23 Tomcats in Arizona, accounting for about $900,000 of TRI-Rinse's contract. The military is considering using the same process on its other F-14s.

The company has developed portable shredding machinery so the Pentagon can have sensitive items destroyed on a base instead of shipping them long distances to be shredded.

The Tomcat was a strike fighter with a striking price tag: roughly $38 million. By the 1980s it was a movie star with a leading role in the Tom Cruise classic "Top Gun." But as the planes are mangled into unrecognizable metal chunks, the jets with a 38-foot wingspan appear small and vulnerable.

The shearing machine, which uses pincers to rip apart the planes, weighs 100,000 pounds. The shredder is 120,000 pounds. An F-14 weighs about 40,000 pounds.

Among the shredded victims in Arizona: a plane flown by the "Tophatters" squadron, which led the first air strike in Afghanistan when the U.S. invaded in October 2001.