When defending on bridge, if you go past the EV and into where the doorway leads to the stairs to the bridge and ammo area, there’s a bug. Drop the ammo station just to the left of the door as close to the wall as you can. You will find a spot where the health station disappears, doesn’t provide health, and you get a full cooldown indicating that you successfully deployed it.
Also of note, if the glass has been shot out above the EV and someone does an airstrike, your health station will be destroyed even though you’re fully covered under the bridge with no way for the airstrike to actually hit your health station.