Operation Flashpoint: Resistance
Operation: Forge the Deep
Operation H.O.P.E.
Operation: Inner Space
Operation: New Earth
Operation Octo
Operation Osam Bin Laden
Operation: Polygon Storm
OP
Operation Red Dragon
Operation S
Operation Sheep Defense
Operation Siege
Operation: Strike & Secure
Operation: Surface Takeover
Operation Swat
Operation: Tango - Challenge Mode
Operation: Vicus
Operatives: Revolve
Operator
OPG: Clan Wars
Ophidia
Opie: The Defender
