For the Mi-8, if you are trying to remove the tail bort numbers, put the file name as empty..example:
{"mi_8_BALKA_1_2_NUMBER_001", DECAL ,"empty",true};
For the Huey, missing Textures are common with misspelled words...as an example, look at:
DCS World OpenBeta\Bazar\Liveries\uh-1h\USA Red Flag
See the 3 files that are inside the folder (beginning with redflag)
then look inside the lua file and notice how they have the word "false"
use that as a baseline for your lua file.
meaning whatever files you have modified in the folder, it says false...
and whetever you do not modify...it says true