 The terrain proved tough for the other units used to fighting rebels in the jungles and remote, uphill areas.The Light Reaction Regiment (still a Battalion at the time) consisted of battle tested soldiers recruited from the Army's elite fighting units, the Scout Rangers and the Special Forces.The unit was undermanned throughout the operation, only being at 40% authorized manpower and had to be augmented by 45 SEALs from the navy's Naval Special Operations Group.