First of all thanks for your concerning about my quetion.
As you see in the picture that Aeyes upload previously, the airbases are broken in my Vietnam Theater..
I found that the modification of 'theater.l2' file in VT package can correct the problem..
(is it right..?)
I tried to correct this as the tutorial indicated but it's too difficult for me to correct airbase leveling..
So if anyone changed the problem of 'the airbase level', I want to get his 'theater.l2' file...
Because my English is so poor I wonder if I can explain what I want to say..
But with this picture i think you can get the meaning.