Chainsaw/Doom 3

The Chainsaw is an extremely powerful close-quarters combat weapon, based on the classic weapon. The chainsaws in the game were sent to the Mars Base instead of Jackhammers by the Mixom Corporation. It's the game's most powerful melee weapon first found in Service Room 2A of Communications Transfer.

Tactical Analysis
The chainsaw can be used as a last ditch attempt to survive when out of ammunition or as a means to dispatch zombies due to the fact the weapon has infinite ammunition like it's classic counterpart. Usage on powerful enemies is not recommended on larger enemies as they well counter-attack, potentially causing heavy damage to the player.