Vertibird signal grenade

The Vertibird signal grenade is 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 its 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, The Minutemen, or The Railroad upon completion of the former's main questline.

Variants

 * The Minutemen have two similar support items, flares and smoke grenades. The flare will signal for troops and the smoke grenades direct a strike from nearby artillery.
 * The Institute have synth relay grenades to spawn synths.

Locations
First given by Elder Maxson as a reward for the quest Show No Mercy. 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 