The "bad" contacts of Sidorovich

Some big shot from the mainland ordered an artifact from Sidorovich, and he botched the order. The client got angry and hired the military hit squad to kill him. Sidorovich asks you to protect his bunker from the militaries, by ingesting a mutated crow egg and taking down the helicopters while flying.
Parts of this quest are unmarked.
== Walkthrough ==
Speak to Sidorovich. He will send you away, promising to message you when the military will attack. Walk out of his bunker; after 60 seconds he will message you again, urging to get back. Speak to him. He sets additional requirements on the job:
* you must only use the 6G30 and VOG-25P charges he gave you;
* you must not save the game during the mission.
Get out of the bunker, take off your armor and weapon, and eat the egg he gave you. Start the flight, and equip his 6G30. Don't worry about having just 12 grenades - Sidorovich will bring you more mid-flight once they are depleted. (how on Earth?..)
Helicopters and BTRs will start spawning all over the Rookie village, and later on the soldiers as well, fighting stalkers in the village.
During the flight, you are invulnerable, so you can just fly into helicopters and shoot point blank. Your job is to eliminate the military. Make sure you don't hurt the stalkers! Don't get too close to the railway as well. Dive from above and aim for the main rotor axle to take helicopters down in one shot. Aim for the turret for the BTRs.
Once the mission is finished, put your armor on to end the flight, and come to Sidorovich for your reward. You'll have to return the gun and grenades.
== Notes ==
* Despite Sidorovich saying so, you are not limited to the grenade launcher that he gives you. You're free to equip any weapon you like, including the PTRD to quickly deal with the helicopters and APCs.
* Everyone important in the rookie village appears to be invulnerable during the quest. A couple of regular rookies may die.
* Once the last helicopter has been destroyed, your invulnerability ends immediately even if you are still in flight. Take care of all the soldiers before the final helicopter squad.
== Bugs ==
* Try to make sure the helicopters are over solid ground when you kill them. A helicopter shot down outside of the map will continue careening towards the ground without actually ever crashing. Leaving and re-entering the area reloads the helicopter into a bugged, invisible state where it can't move or change direction but still shoot its guns and rockets at anyone in its firing path.
** The invisible helicopter can be shot down if located correctly, but since it is still located outside of the map and cannot crash the same process repeats.