San Diego’s defense and transportation manufacturing industry, long a workhorse of the San Diego regional economy, remains a major economic force today. The region has the largest military concentration in the nation and is home to the Space and Naval Warfare Systems Center (SPAWAR), with more than $1.2 billion annually in contracts and salaries in the San Diego region. The depth of business, labor force talent and experience, and world-class university research programs are reasons companies such as SAIC, Goodrich Aerostructures, General Atomics Aeronautical Systems, NASSCO (National Steel and Shipbuilding Company), Southwest Marine, Predicate Logic and Northrop Grumman benefit from doing business in San Diego. Products currently manufactured in San Diego include satellite communications systems, electronic systems, unmanned aerial vehicles, propulsion systems, deep space cameras, rugged military computers and displays, and robotic roving vehicles.