Operation Wolf (Rev 0A) indicates a revised version (Revision 0A) of the game released in the USA for the NES. The base game, originally by Taito, is an action light gun game where the player rescues hostages while shooting enemies. This revision (Rev 0A) could include bug fixes, slight gameplay tweaks, or even minor graphic improvements compared to earlier releases of the Operation Wolf NES port in the USA. 

Operation Wolf (USA) (Rev 0A)

Operation Secret Storm (USA) (Unl)