Orlando has the 7th-largest research park in the country, Central Florida Research Park, with over . It is home to over 120 companies, employs more than 8,500 people, and is the hub of the nation's military simulation and training programs. Near the end of each year, the Orange County Convention Center hosts the world's largest modeling and simulation conference: Interservice/Industry Training, Simulation and Education Conference (I/ITSEC). Metro Orlando is home to the simulation procurement commands for the U.S. Army, Navy, Air Force, Marines and Coast Guard.