Did you ever see Runaway? with Tom Selleck and Gene Simmons? Simmons had a heat-seeking bullet...
Very interesting Jeff_F_F . Would it be looking at the same thing from a different angle to think about artillery that could hit the correct person in a group w/o harming the others. Could a 155 shell function like a UAV with camera, controlled glide and a gun? The flare could be replaced with a device that produced no light but generated heat to slow the decent of the device like a hot air balloon?
Another way of putting it, is a high powered rifle the ideal "sniper's" weapon? What about a precision-guided 60mm mortar or an NLOS missile like spike with fiber-optic TV guidance?