Columbia subject headings:
National security--Law and legislation--United States.
National security--United States.
Obama, Barack.
Terrorism--United States--Prevention.
United States--Politics and government--2009-2017.
Harvard subject headings:
Guantánamo Bay Detention Camp
National security--United States--History--21st century
Obama, Barack
Terrorism--Prevention--Government policy--United States
United States--Politics and government--2009-2017.
Princeton subject headings:
National security--Law and legislation--United States.
National security--United States.
Obama, Barack.
Terrorism--United States--Prevention.
United States--Politics and government--2009-.