[King Franky]

Here's the path to that file on my PC:

D:\Programme\Ubisoft\IL-2 Sturmovik 1946\Missions\Campaign\DE\channel_1941

Maybe your's a little bit different.

Oh, wait!!!

I've looked in my .mis file from mission 6 and found that at the beginning:

[MAIN]
MAP FinsGulf/load.ini
TIME 21.0
CloudType 2
CloudHeight 1000.0
player g0100
army 2
playerNum 0
[Wing]
g0100
I_JG2602
30thSqn01
3F_31a00
[g0100]

Maybe you need just change the '3' to a '2'...

Open the .mis file with Notepad, make your changes and don't forget to save.