Category for Half-Life: Opposing Force.
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- Half-Life and Portal universe
- Half-Life: Generation
- Half-Life: Opposing Force
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- Half-Life: Opposing Force storyline
- Headcrab
- HECU Engineer
- HECU Medic
- HECU Radio
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- Houndeye
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- Santego Military Base
- Sector A Training Facility
- Sector C Test Labs
- Sector E Biodome Complex
- Sector F Lambda Complex
- Sector G Hydro Electric
- Michael Shapiro
- Sharpe
- Adrian Shephard
- Shock Roach
- Shock Trooper
- Snark
- Spore Launcher
- Sprite
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- Jon St. John
- Standard Headcrab
- Standard Zombie
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