These counterfeit parts could be made of inferior metal & electronics. Or worse the electronic boards could have a trojan device on it making our defense weapons inoperable.
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Mebbe I'm not so paranoid afterall.
http://www.huffingtonpost.com/2012/09/13/laptop-virus_n_1879...

A customer in Shenzhen, China, took a brand new laptop out of its box and booted it up for the first time. But as the screen lit up, the computer began taking on a life of its own. The machine, triggered by a virus hidden in its hard drive, began searching across the Internet for another computer.

The laptop, supposedly in pristine, super-fast, direct-from-the-factory condition, had instantly become part of an illegal, global network capable of attacking websites, looting bank accounts and stealing personal data.

For years, online investigators have warned consumers about the dangers of opening or downloading files emailed to them from unknown or suspicious sources. Now, they say malicious software and computer code could be lurking on computers before the bubble wrap even comes off.

The shopper in this case was part of a team of Microsoft researchers in China investigating the sale of counterfeit software. They suddenly had been introduced to a malware called Nitol. The incident was revealed in court documents unsealed Thursday in a federal court in Virginia. The records describe a new front in a legal campaign against cybercrime being waged by the maker of the Windows operating system, which is the biggest target for viruses.