From the Document: "The United States maintains a global military presence to support foreign policy and military strategy. Representation ranges from one Marine in Sierra Leone to an Army Corps in Germany, and is found in 144 nations. In some countries, presence is maintained continuously and service members are assigned tours of one to three years. In other countries, there may be short term deployments of units or teams in response to emergencies or training opportunities. This report describes the worldwide distribution of U.S. military personnel and related concerns of Congress. It will be updated quarterly."
CRS Report for Congress, RS20649