Air Force officials filled 770 positions across nine developmental special duties, or DSDs, for spring 2017. The DSD nomination process occurs twice each year and is designed to fill specific special duties the Air Force has acknowledged as developmental due to their unique requirements. Commanders are encouraged to nominate any Airman in the rank of staff, technical and master sergeant they feel is the right fit for these critical duties. Nominees must have a demonstrated record of exceptional performance and a high capacity to lead.