Heaven forbid that Donald Trump Jr. said something that was accurate! Let's go through the US-based defense companies and look for CURRENT (not past) members of any board of directors okay? https://twitter.com/Susan_Hennessey/status/1318680504204464128

Lockheed Martin Corporation
Bruce A. Carlson - Retired U.S. Air Force General
Joseph F. Dunford, Jr. - Retired U.S. Marine Corps General

Raytheon Technologies
Lloyd J. Austin III - General, U.S. Army (Ret.) and Former Commander of U.S. Central Command
Ellen M. Pawlikowski - General, U.S. Air Force (Ret.)
James A. Winnefeld, Jr. - Admiral, U.S. Navy (Ret.)

The Boeing Company
Edmund P. Giambastiani Jr. - Seventh Vice Chairman of the U.S. Joint Chiefs of Staff
John M. Richardson - 31st Chief of Naval Operations, U.S. Navy; Former Director of the Naval Nuclear Propulsion Program, U.S. Navy

Northrop Grumman Corporation
Gary Roughead - Admiral, United States Navy (Ret.), Former U.S. Navy Chief of Naval Operations

General Dynamics
James N. Mattis - Retired General, U.S. Marine Corps. United States Secretary of Defense
Cecil D. Haney - Retired Admiral, U.S. Navy

Huntington Ingalls Industries
Augustus Leon Collins - Major General, U.S. Army (Ret.)

L3Harris
General Peter W. Chiarelli, U.S. Army (Ret.)
General Lloyd W. Newton, U.S. Air Force (Ret.)

KBR
General Lester L. Lyles, USAF (Ret.)
Lt. General Wendy M. Masiello, USAF (Ret.)

AECOM
Gen. Janet C. Wolfenbarger, USAF Ret.

ManTech
Lt. Gen. Kenneth A. Minihan, USAF (Ret.)

CACI
Admiral Gregory G. Johnson, USN (Ret.)
General William Scott Wallace, USA (Ret.)

Oshkosh Corporation
Raymond T. Odinero - Retired General, United States Army

Former members of Raytheon Board
Barbara M. Barrett - 25th Secretary of the Air Force
James E. Cartwright USMC General
Vernon E. Clark USN Admiral
John M. Deutch - Director of Central Intelligence

Former members of Raytheon Board
Stephen J. Hadley - US National Security Advisor
Letitia A. Long - Director of National Geospatial-Intelligence Agency
Warren B. Rudman - US Senator New Hampshire

Former members of Boeing Board
James L. Jones – USMC General
John M. Shalikashvili - USA General

Former members of Lockheed Martin Board
Bruce A. Carlson - USAF General
James O. Ellis, Jr. - USN Admiral
Jeh C. Johnson - US Homeland Security Secretary

James M. Loy - USCG Admiral
Joseph W. Ralston - USAF General

Peter Schoomaker - Dyncorp / CAE USA / MAG Aerospace
Eric Shinseki - Honeywell / Ducommun
James F. Amos - LORD Corporation
Jonathan Greenert - BAE Systems

Jay Johnson - General Dynamics
Mark Welsh - Northrop Grumman
Duncan McNabb - AAR Corporation
John P. Jumper - SAIC CEO / Leidos

I could go on. Just look at the Joint Chief of Staff and look through the past members of the Joint Chief. You'll find that a ton of them have served or currently serve on many defense companies.