"Hangar 18" has a riff also used by Metallica, in "Call of Ktulu", from Ride the Lightning, which was written while Dave Mustaine was a member of Metallica.
... town the population is spread out with 22.3% under the age of 18, 6.3% from 18 to 24, 31.0% from 25 to 44, 26.9% from 45 to 64, and 13.5% who are 65 years of age or older. ...