By crows nest i am pretty sure it meant any building
Doubt they would put anything like that in the game like from SC2.
But looking at that Ui bit i see 5 abilities..
1) something with a truck, possibly resources ?
2)Looks like the terror officer, perhaps some sort of replacement unit for the officer ? Thus also confirming the officer back in CoH2
3)Airstrike
5)artillery strike
6) Tiger tank, probably unlocking it in a building.