Is PGP crackable

["Edwards, Benjamin ()" <Benjamin.Edwards@DIGIFONE.COM>]

I am writing an article about PGP and have one simple question.  Can PGP
keys be cracked.  Someone I worked for used to (allegedly) work for the US
army.  He (allegedly) says the army got comms equipment 6 years before it
was commercially available.  If this was the case with computer hardware I
guess the question would be 'Would it be possible to crack a 4k key if we
had the computer equipment that would be available in 6 years from now?'

Thanks in advance,
Ben