Trainers at skill level 3 or higher are certified to teach all courses lower than their certification level. Skill level 1 and 2 courses are now usually taught and participants certified at the unit level. Skill level 3 and 4 courses are usually held at Ft. Benning, GA. A Soldier who has a level 3 certification can certify other Soldiers to be skill level 1. Soldiers who are skill level 4 can certify other Soldiers to be skill level 1 or 2.