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|next=''[[Half-Life: Blue Shift]]''<!--- This follows the game release dates. --->
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'''''Half-Life: Opposing Force''''' (, commonly referred abbreviated to as '''''OpFor''''' or '''''Op4'') ''', is a critically acclaimed expansion pack for ''[[Half-Life]]'', developed by [[Gearbox Software]] and released by [[Sierra Entertainment]] on November 19, 1999.
==Overview==