Marines try out different CamelBak nozzles while a vendor explains the pros and cons of each one at the third annual Experimental Forward Operating Base aboard Marine Corps Base Camp Lejeune, May 4. One of the main focuses of the ExFOB was to improve water quality and taste. - Marines try out different CamelBak nozzles while a vendor explains the pros and cons of each one at the third annual Experimental Forward Operating Base aboard Marine Corps Base Camp Lejeune, May 4. One of the main focuses of the ExFOB was to improve water quality and taste.