unit of service. unit of service. any individual, family, aggregate, organization, or community given nursing care. The level at which service is delivered varies with the particular unit entity.
A foreign affiliate as defined in inward FATS statistics is an enterprise resident in a country which is under the control of an institutional unit not resident in the same country. Control is determined according to the concept of the 'ultimate controlling institutional unit' (UCI).
If an employer has more than one foreign affiliate, a section 3121(l) agreement does not have to apply to all of them. The agreement must apply, however, to all U.S. citizens and resident employed by any foreign affiliate that is designated in the agreement.