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In page Interservice/Industry Training, Simulation and Education Conference:

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Peak attendance at I/ITSEC occurred in 2011, with approximately 20,000 attendees. Attendance declined to approximately 17,000 in 2012[1] and to 14,000 in 2013 and 2014 due to new restrictions with US military and government travel. As a result, conference leaders are taking steps to attract more international attendees, and they have begun expanding I/ITSEC's offerings to appeal to modeling, simulation, and training professionals who work in sectors outside of the defense and security sectors, such as healthcare, civil aviation, transportation, and disaster relief.[2]