A drill instructor was a member of the mercenary group Militaires Sans Frontières in the 1970s. He conducted various exercises as part of MSF's training regimen. As expected of a drill sergeant, he was loud, quick, and sharp with the trainees, sometimes sarcastically suggesting that they kill themselves immediately if they stood around like an idiot in front of the enemy to drive the point home about the essentials of changing positions.
In November 1974, the instructor conducted a training exercise at the MSF's Colombian camp, where his commander Big Boss joined the trainees in their session.
Behind the scenes
The drill instructor appears in the opening prologue of Metal Gear Solid: Peace Walker. Concept art in the Peace Walker Official Art Works book shows a heart tattoo on his left arm, with the words "Love of country," while wearing a T-shirt that says "Army."