Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.141.15 Restrictions on employment

(a) Each employer of personnel on any unit engaged in OCS activities that is subject to this part must employ, as members of the regular complement of the unit, only citizens of the United States or resident aliens except as provided by § 141.20.

(b) As used in paragraph (a) of this section, “regular complement of a unit” means those personnel necessary for the routine functioning of the unit, including marine officers and crew;  industrial personnel on the unit, such as toolpushers, drillers, roustabouts, floor hands, crane operators, derrickmen, mechanics, motormen, and general maintenance personnel;  and support personnel on the unit, such as cooks, stewards and radio operators. The term does not include specialists, professionals, or other technically trained personnel called in to handle emergencies or other temporary operations;  extra personnel on a unit for training;  and other personnel temporarily on a unit for specialized operations, such as construction, alteration, well logging, or unusual repairs or emergencies.