Computer security

A British hacker somehow managed to shut down the US Army's computers for 24 hours.
I didn't hear about this.  I thought this comment was interesting.

He had used his own computer with a 56K dial-up modem at his London home with no password protection and somehow managed to evade every security measure the U.S. military had adopted.

70 years seems excessive.  Perhaps the Army should hire this guy rather than put him
in jail.