The present close relationship between the U.S. and Turkey began with the agreement of July 12, 1947, which implemented the Truman Doctrine. As part of the cooperative effort to further Turkish economic and military self-reliance, the United States has loaned and granted Turkey more than $12.5 billion in economic aid and more than $14 billion in military assistance.
Also, from the fact sheet linked in the article:
Between 2009 and 2011, U.S. exports to Turkey increased 106 percent and, from 2010 to 2011, U.S. FDI in Turkey nearly tripled. Over 1,200 U.S. companies now operate in Turkey – an increase of nearly 50 percent since 2007. Over the last two years, new investments by Cummins, Pratt and Whitney, AES, Dow, GE, 3M, AMGEN, and Pfizer are illustrative of increasing U.S. private sector interest in Turkey. Many of the new successful joint ventures between U.S. and Turkish firms are designed to manufacture innovative products in Turkey for both domestic production and export to third country markets. Examples include:
General Electric invested $900 million in 2012, AmGen made a $700 million acquisition, and 3M announced a $500 million project.
Ozkan Steel is planning to invest $150 million in a plant in Louisiana that will produce steel for the shipbuilding industry.
Borusan Mannesmann intends to manufacture steel pipes for shale gas production, investing $150 million in a construction facility that should become operational in the second half of 2014. These two projects will create hundreds of jobs in the United States.
DOW recently partnered with the Turkish firm AKSA to produce carbon fiber in Turkey –
a $1 billion in investment in Turkey over the next five years – with plans to re-export to third markets in the future.
Sikorsky Aircraft Corporation has been selected to supply a $3.5 billion order for 109 S-70i Blackhawk helicopters to Turkish Aerospace Industries.
http://www.eucom.mil/mission/the-region/turkey