After completing Old Wounds, you will have to do a Strikeforce mission before being able to move on with the Campaign levels. This mission is FOB Spectre and when you choose to start it, you will go through a tutorial level explaining the basics of Strikeforce missions. You can choose to skip the tutorial, although it is best to do it.
After finishing FOB Spectre, you will have the option to choose to play Strikeforce missions throughout the rest of the Campaign. Note that these are completely optional, but they will disappear after completing a certain number of Campaign missions.
- FOB Spectre - Mandatory after finishing Old Wounds
- Shipwreck - Available after finishing FOB Spectre; Disappears for 4 Campaign missions
- I.E.D. - Available after finishing Fallen Angel; Disappears after 2 Campaign missions
- Second Chance - Available after letting DeFalco escape with Karma in Karma; Disappears after finishing Suffer With Me
- Dispatch - Available after finishing Suffer With Me; All Strikeforce missions disappear after finishing Achilles' Veil
