Movement of a unit or force within another nation's specified operational area outside of territorial seas and territorial airspace for surveillance or intelligence gathering in time of peace or tension. Intrusion is intentionally inserting electromagnetic energy into transmission paths in any manner. The object is to deceive equipment operators or cause confusion. The enemy conducts intrusion operations against us by inserting false information into our receiver paths. This false information may consist of voice instructions, ghost targets, coordinates for fire missions, or even rebroadcasting or prerecorded data transmissions.