{HEAD ~ The improvement} comprises {TAIL ~ means} for locating a target with respect to the generation subsystem and means for locating an aiming point in the image display subsystem with respect to the image generation subsystem 
comprises
{ HEAD ~ The improvement } comprises { TAIL ~ means } for locating a target with respect to the generation subsystem and means for locating an aiming point in the image display subsystem with respect to the image generation subsystem
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH