Please add modifications on the base icons depending on some strat factors.
It should be an icon based on the actual one with some complementary modifications based on their status indicating, for example, triangles:
No ack (triange over the base square).
No planes (closed) (triangle left of base square).
No vehicles (closed) (triangle right of base square).
No radar (triangle below of base square).
This way, a closed base with no acks and no radar will be seen as a romb.
