A fireball erupts from a ring of fire, January 10, at Engineer Training Area 3, a circuit of explosives that Marines put together moments before as part of the basics learned by Marines during the three-day classes and one day of rehearsals. What the instructors wanted the Marines to really gain from this training were the basics. Learning the basics here offers the Marines a foundation to build on for the future, said Sgt. Steven Kenner, a chief instructor with 2nd CEB.