took a quick look at this in mission builder
Looks like at the end of mission it randomly points towards then other three missions, so if you flew Central Offensive than you would get randomly Entente Offensive but could be map 1, 2 or 3. I assume each mission runs that way. Unless I have all six missions should likely disable that.
Other thing I noticed is even though the files are numbers 01, 02, 03..the file name only says Central Offensive. Is this so when the map is loading you wouldn't be able to identify which version you where flying? ( or am i overthinking this?)
My first try running this it ran very slow, not sure if it is because there are so many objects. I will go into mission builder and resave it, and try it on the server, might do better there than on my machine.
Hope I don't sound like a pest, just digging into it a bit to try and understand how it works!