Call-in Time
From Helldivers 2 Wiki
Call in time starts at the point when the beacon thrown by the player, projects a light into the sky. The beacon prefers to plant itself to ground level areas and certain high level areas that is accessible to enemies. The beacon will bounce away until it finds suitable ground to plant itself to the ground (i.e. if Helldivers dive onto a spot that enemies can not climb up to or destroy a sentry stratagem)