Sergeant Michael W. Elliot, a reconnaissance Marine with 2nd Reconnaissance Battalion, 2nd Marine Division, puts on swimming fins before starting a exercise requiring them to tread water while manually inflating a flotation device March 28. The training was part of a two-week course designed to prepare Marines for rigorous testing at the Marine Combatant Diver Course at the Navy Diving and Salvage Training Center in Panama City, Fla. - Sergeant Michael W. Elliot, a reconnaissance Marine with 2nd Reconnaissance Battalion, 2nd Marine Division, puts on swimming fins before starting a exercise requiring them to tread water while manually inflating a flotation device March 28. The training was part of a two-week course designed to prepare Marines for rigorous testing at the Marine Combatant Diver Course at the Navy Diving and Salvage Training Center in Panama City, Fla.