Sgts. David A. Lopez, left, Roberto A. Martinez, center, and Paul A. Baran pose for a photo Feb. 9 at Kin Blue Training Area. The three sergeants gave their keys to success as small unit leaders in the Marine Corps. Lopez, from Blue Island, Illinois, is a data systems technician. Martinez, from Sterling, Illinois, is a motor transport operator. Baran, from Vancouver, Washington, is a ground radio repairer. The Marines are with Combat Logistics Regiment 3, 3rd Marine Logistics Group, III Marine Expeditionary Force. - Sgts. David A. Lopez, left, Roberto A. Martinez, center, and Paul A. Baran pose for a photo Feb. 9 at Kin Blue Training Area. The three sergeants gave their keys to success as small unit leaders in the Marine Corps. Lopez, from Blue Island, Illinois, is a data systems technician. Martinez, from Sterling, Illinois, is a motor transport operator. Baran, from Vancouver, Washington, is a ground radio repairer. The Marines are with Combat Logistics Regiment 3, 3rd Marine Logistics Group, III Marine Expeditionary Force.