According to this map by Bloomberg, in 2012 approximately 12.5% of active-duty military personnel were stationed outside the United States, in places like Afghanistan, Turkey, Australia Canada, Greenland, Colombia, Guatemala, Honduras, Egypt, Myanmar, South Korea, Greece and Western Europe.

The pie chart above shows the top 14 places where the U.S. has active duty soldiers stationed.

Resources:

• Bloomberg: Defense Budget at Center of Spending War – Infographic
• VetFriends: US Deployment Facts-How Many US Troops are Overseas?