Dennis Sheeley (2nd from left), an antiterrorism analyst at Marine Forces Reserve Headquarters in New Orleans, explains physical security measures to Marine Corps antiterrorism officers during a small-group practical application exercise here April 6. Active duty and reserve Marines from more than 30 MARFORRES units came here for a week-long Level II AT certification training program. - Dennis Sheeley (2nd from left), an antiterrorism analyst at Marine Forces Reserve Headquarters in New Orleans, explains physical security measures to Marine Corps antiterrorism officers during a small-group practical application exercise here April 6. Active duty and reserve Marines from more than 30 MARFORRES units came here for a week-long Level II AT certification training program.