Lieutenant Colonel Dave Grossman is a retired Professor of Military Science at Arkansas State University and author of several books on the subject of the psychology of killing. This includes Stop Teaching Our Kids to Kill: A Call to Action Against TV, Movie and Video Game Violence.
Another Dave Grossman is a writer, game programmer and game designer, most notable for his work on LucasArts' point-and-click adventure games The Secret of Monkey Island, Monkey Island 2: LeChuck's Revenge and Day of the Tentacle, and more recently various adventure games developed by Telltale Games.
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The Lieutenant Colonel is featured in a strip, where Gabe drives him over as he crosses the street holding a coffee mug, severing his legs in the process.