there were no forerunners
The forerunners, or ancestors, left behind relics of their greatness.
Rocker
Two of the forerunners of probation are judicial reprieve and bail. A third forerunner of probation is for a person to be released on their own recognizance.
They fly helicopters.
Helicopters are about 200 feet
A group of helicopters.
Helicopters are machines, they can not grow.
what are the grey helicopters for
yes, helicopters are dangerous
An ancient race that built the Halo rings and the Ark in order to starve the flood. It is revealed by 343 Guilty Spark that humans are descendants of the Forerunners.
The alliteration for helicopters could be higher helicopters or heavy helicopters
trombone and the trumpet