ETSA has a very special relationship with the National Training and Simulation Association (NTSA) based in Arlington, Virginia, USA.

NTSA, an affiliate of the National Defense Industrial Association (NDIA), provides the training, simulation, related support systems and training services industries a focused, formal organization to represent and promote their business interests in the market place.

The Association provides a forum to communicate the full capability and broad characteristics of all of the elements of training systems and services to include associated support services.

Founded in 1988, the Association fosters communication between the training agencies regarding requirements, procurement issues and policies.

NTSA and ETSA signed a Memorandum of Understanding at I/ITSEC 2011. In 2017, this MoU was updated to better reflect the status and modus operandi of ETSA and the relationship with NTSA.

NTSA and ETSA are part of the International Training and Simulation Alliance (ITSA).

ITSA is a network of training and simulation associations worldwide that have aims in common, including improving cooperation between different training and simulation communities throughout the world.