Due to federal restrictions contained in the current National Defense Authorization Act, citizens of the People's Republic of China-including the special administrative regions of Hong Kong and Macau-as well as citizens of the Islamic Republic of Iran, the Democratic People's Republic of Korea (North Korea), and the Russian Federation, who are not Lawful Permanent Residents ("green card" holders) are prohibited from accessing facilities that support the mission, functions, and operations of national security laboratories and nuclear weapons production facilities, which includes Los Alamos National Laboratory. Additional responsibilities include leading complex switching and restoration activities, evaluating abnormal operating conditions, developing operational strategies and technical solutions, leading procedure and switching-practice improvements, mentoring less-experienced operators, and recommending improvements to system reliability and operability.