I always pictured him like one of the guys on my team in infantry officer training... 6'4, 16 stones of solid muscle (could lift a 150-pound barrel with hands only). Build like a bouncer--a bit wide; close-cropped sandy hair, eyes of indeterminate (but light) color, clean-shaven square face.

(On second thinking, my pal then was more of a Yxtrang... I still remember him actually sprinting through a 250-yard live-fire exercise uphill, with an M-16 held like a toy gun, spouting a bullet whenever his feet touched the ground--for a perfect score of 100 hits from 100 bullets... Frightening image :))