Whenever you have a successful mission in Multiplayer, you will gain a Galactic Readiness Percentage increase in your Singleplayer (i.e. Multiplayer: - Has a small but noticeable Affect on your Single Player Campaign. Black Widow, and other weapons of N7 Quality.) Allowing you to know what weapons you want with what mods and classes. Single Player: Has no affect on your Multiplayer besides you gaining experience with different weapons that would ultimately be harder to get in Multiplayer (i.e.
