TSHv4 provides a subset of the Iraq theater from Jane's F-15 in Jane's F/A-18. The Iraq theater provided was initially introduced in TSHv2, but no longer requires ownership or installation of Jane's F-15. The Iraq Theater is included by default with TSH v4 and requires no user options to install.
However, before starting Jane's F/A-18 one must activate the desired theater. To do this, run the Worldswapper.exe utility, found in your main \FA-18 folder. Single missions and campaigns available in-game are controlled by the selected theater (i.e. one will see North Cape missions/campaigns when starting the game with the NCape theater activated, and one will see Iraq missions/campaigns when starting the game with the Iraq theater activated).