You play in the role of Captain Percy Freeman, a Special Forces officer who is assigned the task of tracking down and assassinating the renegade Colonel Kurtz. Things take a turn for the worse when, having set off on your mission, the higher-ups in the chain of command mysteriously decide that they want you dead, while you discover to your horror that someone has been breeding an inhuman master-race of hideous undead mutants which is now rampaging across the jungle slaughtering everything in its path. Stuck between the Viet-Cong, the U.S. Marine Corps, and the hordes of mindless zombies, with only your sidekick Barney for company and your trusty chainsaw for a weapon, your one remaining hope is to keep going deeper and deeper into enemy territory, wading through the bodies of the fallen, towards the elusive Kurtz...
Half-life 1?
Half-Life: Source
I'm thinking about something... this game has a lot of references to Apocalypse Now, and the main character in that movie was named "Willard" So why not call the main character in this like... William