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Make sure when you are defending you call in fire support as soon as it's up as bombarding the enemy with artillery and gas will help delay their progress.
A good tactic when attacking is to call a smoke barrage. The closer you can call it to where the enemy marksman are positioned the better.
Below is a list of the different support you can call in and how long it will take to arrive.
30mm Strafe Run:
27 Seconds till strafe begin.
Grenade Drones:
30 Seconds until payload detonation.
IED Drone:
Spawns in 30 seconds, seeks out target.
Rocket Barrage:
35 Seconds until barrage begin.
Explosive Artillery:
48 Seconds until first shell hits.
Minigun Support:
40 Seconds to arrive, stays for 30.
Gunship Support:
40 seconds to arrive, stays for 20.
Smoke:
47 Seconds until first shell hits.
Chemical Mortar:
46 Seconds until first shell hits.