Leonardo (Italy)
Leonardo is a global high technology company & a key player in #Aerospace #Defence & #Security. We offer our clients continuous innovation through the capabilities delivered by our Divisions (Helicopters, Aircraft, Aerostructures, Airborne & Space Systems, Land & Naval Defence Electronics, Defence Systems, Security & Information Systems) and through our subsidiaries and joint ventures.
Note: It is the eighth largest defence contractor in the world based on 2018 revenues
Products: Eurofighter (join venture)

BAE Systems (UK)
Official channel of BAE Systems plc, one of the world's leading global defence, security and aerospace companies.
Note: It is the largest defence contractor in Europe,[7] and ranked the seventh-largest in the world based on applicable 2021 revenues.
Products: M2/M3 Bradley, Challanger 2 MBT, Archer

Lockheed Martin (USA)
Headquartered in Bethesda, Maryland, Lockheed Martin is a global security and aerospace company that employs approximately 110,000 people worldwide and is principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services.
Note: Probably the biggest one of all
Products: F-117 Nighthaw, F-22 Raptor, etc etc