100 roentgens there is a grave risk that their commands wiJl rapidly become ineffective as fighting units. e. Internal radiation hazards caused by entry of radioactiYe 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 a taken. Only under unusual circumstances will there be internal hadard from residual contamination. This eliminates the necessity for masking and consequent reduction of tactical efficiency. 14. This appendix has been designed for reduced security classiffication in order to facilitate wide dissemination. Original signed by the Assistant Chief of Staff, Jfor the Commander Joint Task Force 7 445