What company was the fifth-largest defense contractor in the world in 2015 and is part of the VITA working group?
VPX:  Defined by the VITA (VME International Trade Association) working group (composed of companies such as ADLINK, Aitech, Boeing, Curtiss-Wright, Elma Electronic, Extreme Engineering (X-ES), GE Intelligent Platforms, Kontron, Mercury Computer Systems, Pentek, Cornet Technology, Inc., and Northrop Grumman), it has been designed specifically with defense applications in mind, with an enhanced module standard that enables applications and platforms with superior performance. Northrop Grumman:  The company was named as the fifth-largest defense contractor in the world in 2015.
Northrop Grumman