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