A wide range of global threats posed by Islamic State militants and nations like Iran are continuing to fuel the sale of American-made arms around the world.

Despite slower domestic sales in the U.S., the foreign market remains ripe. Lockheed Martin, the world’s largest defense contractor, reported that foreign orders made up 21 percent of the company’s $46.1 billion in 2015 sales. That’s a six percent jump in foreign sales over the previous year.

“We continue to have growing international interest for our programs, particularly in the area of missile defense, in the Middle East, in Asia-Pacific and even in Europe,” Marillyn Hewson, chairman, president, and CEO, told analysts on Tuesday when the company reported its 2015 earnings. […]