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