HELP- Production of heavy weapons

[KIKIN]

Consult. I'm doing something wrong. Every time I can not work out weapons to a higher level (self-propelled howitzer, těžlý air transport and heavy bomber. Town munitions factory at the 14th Air Base and land base 6-7. Farms 5.
Another three cities on the seventh level My battle level 25

8 minutes ago, KIKIN said:

Consult. I'm doing something wrong. Every time I can not work out weapons to a higher level (self-propelled howitzer, těžlý air transport and heavy bomber. Town munitions factory at the 14th Air Base and land base 6-7. Farms 5.
Another three cities on the seventh level My battle level 25

The factory producing weapons Army shows me that I can produce to tan TIGER Tank B-U production aircraft only after stáhač Mustang.