There are dozens of ways foreign countries can get their hands on U.S. military secrets, including cyberhacking, espionage, theft, and more. But one increasingly concerning way has been through unintentional disclosures by trusted defense contractors, including Boeing, 3D Systems Corp., and RTX Corp., parent company of Raytheon.

Aaron Nicodemus is the Editor-in-Chief of Compliance Week. He previously worked as a reporter for Bloomberg Law and as business editor at the Telegram & Gazette in Worcester, Mass. Email: aaron.nicodemus@complianceweek.com LinkedIn:...