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 . Other opportunities for Earth Scientists include well-site operations, reservoir modeling, portfolio management, subsurface data science, technology deployment, technical team leadership, and various technical specialty focused positions such as stratigrapher, structural geologist, geophysicist, petrophysicist, basin analyst, and earth modeler.