Operation Templar
From FreeSpace Wiki
Operation Templar was a series of missions in which the Hammer of Light was crushed. These missions were to be played in the multiplayer co-op option in FreeSpace 2 originally. The Game of the Year edition includes an unmodified, unbalanced single-player version.
If you want to play Operation Templar in singleplayer at its intended multiplayer difficulty level, start it as a network game with yourself as the only player, so you will get respawns.
Operation Templar Campaign Briefings are now available.