100 roentgens there is a grave risk that their commands will rapidly become ineffective as fighting units. e. Internal radiation hazards caused by entry of radioactive substances through the mouth, through the lungs or through cuts or wounds do not exist after an air burst. Internal hazards following a contaminating surface explosion may be avoided if ordinary precautions are taken. Only under unusual circumstances will there be internal hazard from residual contamination. This eliminates the necessity for masking and consequent reduction of tactical efficiency. 14. This appendix has been designed for reduced security classification in order to facilitate wide dissemination. Original signed by the Assistant Chief of Staff, J-3 for the Commander Joint Task Force 7 445