About the warehouse..
Posted: 09 Jul 2020, 10:27
Hello, I'm a green hand.In up1.5,the type of warehouse is anti-air, right 
The warehouse shoots invisible bullets and has an alert siren as attack sound. It could not be added to other buildings, because attacking interrupts units production from a building (so it couldn't be added to City Centers). Warehouses are usually built in every city, separately from other buildings, so it's the best method to detect incoming planes as soon as possible. This is why warehouse has the Anti-Air RPS.— Alert siren when enemy is bombarding your city (requires warehouse).