Introductory note. This chapter deals with the overall subject of conditions of service of staff assigned to field duty stations, and with the scheme for the classification of duty stations according to conditions of life and work. Other aspects of conditions of service in the field are covered under the relevant subject headings e.g. medical examinations (section 8.1), medical evacuation (section 4.3, para. (29)), security arrangements (section 11.2), housing (section 14.4), etc.