Petty officers originate from a petty officer candidate program, which trains military personnel and civilians who take majority - seamen experience is not required to become petty officers. In the ROK Navy, personnel with ranks of "Hasa" (Petty officer) through "Wonsa" are considered petty officers (i.e. non-commissioned officers). Those at "Sangsa" and "Wonsa" are further referred to as "CPO" (chief petty officer) collectively and considered a separate community within the Navy. "CPO"s have privileges such as separate dining and living areas.