Make bridges over real rivers, canyons or obstructions. Have them placed over real obstructions.
And make them so you could destroy them. And then with time would automatic rebuild.
This would add a dimension that took place in WWII. Remember Germany, Italy and France, etc?
You could use dive bombing or bombers, etc. You could even use engineers to set charges to destroy the bridge.
Striking a base supply line bridges to slow down the supply chain of base rebuilding.
This would be more effective to shut off the supply to the base as a whole.
Fuel and ammo would be lost first. This would also keep the down the hangers from popping up after 15 minutes to a full 25 minutes.
If they wanted them fixed quicker make a engineer group for the M3,C47 or jeep transport to rebuild the bridge.
Just food for thought.
<S> GGhost