Sgt. Slaughter
From MediaWiki
Sgt. Slaughter is a member of G.I. Joe in the Generation 1 continuity.

Sgt. Slaughter is the drill sergeant for the counter-terrorist team G.I. Joe. His real name is classified.
Fiction
Marvel Comics continuity
A test of Power Station Alpha was interrupted by the appearance of a giant transforming robot. After the Transformer was destroyed, it was followed by a much larger robot which called itself Superion. G.I. Joe's forces were overwhelmed by Superion, so Scarlett called for backup. Sgt. Slaughter's team of reinforcements consisted of Lady Jaye, Dial-Tone, Ace, and Mutt.
Suddenly, the Transformer retreated. Sgt. Slaughter noted later that its heart didn't seem to be in the job, and that it probably could have killed all of them if it had wanted to.
