The simulator is provided with {HEAD ~ a drop tube} or tower in which {TAIL ~ the projectile} is positioned 
The simulator is provided with { HEAD ~ a drop tube } or tower in which { TAIL ~ the projectile } is positioned
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH