Portugal also provides the United States access to Montijo Air Base and a number of ports. Portugal defines itself as "Atlanticist" emphasizing its support for strong European ties with the United States, particularly on defense and security issues. The Government of Portugal has been a key ally in US, supporting efforts in Iraq, and hosting the Azores Summit that preceded military action. The United States exported $1.47 billion worth of goods in 2006 and imported an estimated $3.04 billion. While total Portuguese trade has increased dramatically over the last 10 years, the U.S. percentage of Portugal's exports and imports has declined. The Government of Portugal is encouraging greater bilateral investment. US firms play some significant roles in the pharmaceutical, computer, and retail sectors in Portugal, particularly in Lisbon, but their involvement in the automotive sector has sharply declined in recent years. Principal U.S. Officials include:  The U.S. maintains an embassy in Lisbon.