Pentagon testing office finds problems — again — with network security system Problems keep mounting for the Joint Regional Security Stacks program. (1st Lt. Lauren Woods/U.S. Air Force) WASHINGTON — For the fourth year in a row, the Pentagon’s chief weapons tester recommended Thursday that components stop migrating to a fraught network security system until the department proves that the system can effectively help defend against cyberattacks. The department’s Joint Regional Security Stacks program faces numerous shortfalls, continuing to provide insufficient network defense capabilities, according to the annual report from the Director of Operational Test and Evaluation office. Components should look to other cybersecurity programs in the department’s pipeline, including work on zero trust, the report recommended.