These export control laws apply to individuals who are (a) not U.S. citizens, permanent resident aliens, temporary resident aliens, applicants for temporary resident status, refugees, or asylees; and who are also (b) current citizens or permanent residents of a country that is subject to comprehensive trade sanctions under U.S. export control law, http://www.treasury.gov/resource-center/sanctions/Pages/default.aspx . Petroleum Engineers within Chevron are part of multi-disciplinary teams which vary in make-up but can include petroleum engineers, geologists, geophysicists, facility engineers, drilling and completion engineers, data scientists, and/or software developers.