 In the E-2C Hawkeye and E-2D Advanced Hawkeye, NFOs are initially as designated radar officers (RO), then upgrade to air control officers (ACO) and finally to combat information center officers (CICO) and CICO/mission commanders (CICO/MC).In the E-6B Mercury, NFOs are initially designated as airborne communications officers (ACOs), then upgrade to combat systems officers (CSOs), and finally to mission commanders (CSO/MC).In the EP-3E Aries, NFOs are initially designated as navigators (NAV) and eventually upgrade to electronic warfare officer/signals evaluator (EWO SEVAL) and EWO/SEVAL/mission commander (SEVAL/MC).