Vertibird signal grenade

The Vertibird signal grenade are a weapon in Fallout 4.

Characteristics
Soon after you throw a Vertibird signal grenade, a Vertibird lands at the marked location. You can then board the vehicle to take control of it’s side-mounted minigun. When you’re ready, exit the Vertibird or use your Pip-Boy’s map to select a new destination. The Vertibird signal grenade can only be used outside, and only by members of the Brotherhood of Steel or the Railroad upon completion of the latter's main questline.

Variants
The Minutemen have two similar support items, flares and smoke grenades.

Locations
First given by Elder Maxson. More can be bought from Proctor Teagan aboard the Prydwen or from Tinker Tom at the Railroad HQ after finishing the main questline for the Railroad.

Gallery
Fo4vgsback.png |CAUTION: Handle all incendiary devices with extreme care. High heat can cause risk of burn or blindness. Fo4vertibirdsupport.png | A vertibird that has been called in and landed 