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it also works when you only use the option 1 and 2 with the trainer. than you can also use airstike inside bunker on the second floor.

i try it yesterday because i had also the problem with the airstike.

so it works.

you must start the level again from beach.

the level i am talking about is the assault on the castle

i was outside

I still can't call strikes on the second level

try not to use trainer,or maybe you were pointing at the wrong place hope this will help you.