"Duty service" refers to the responsibility or obligation one has to fulfill in performing their assigned tasks or completing certain duties. It implies the commitment to carry out their obligations diligently and responsibly. Full definition
This form is especially useful for active duty service members who may need to leave their children for months at a time. (thespruce.com)
Contact the local social work duty service in the area where the child resides and they will decide on follow up actions. (dcya.gov.ie)
Military members with active duty service from 1957 through 1967 will have extra wage credits applied to their accounts when they retire and apply for social security benefits. (sapling.com)