WASHINGTON — The Pentagon established a little-known office in April to support covert efforts to disrupt and sabotage foreign technology programs considered a threat to American military superiority, according to Defense Department records and current and former national security officials familiar with the office. The Technology Support Office, known internally as TSO, has operated with little public visibility. Its name appears in Defense Department historical records and internal memoranda, but the department has not publicly described its mission or operations. Defense Secretary Pete Hegseth and other senior Pentagon officials have not announced the office. The office’s work is highly classified. Twelve current and former U.S. national security officials with varying degrees of knowledge of TSO were consulted about its formation and broad mission, but specific operations and capabilities remain undisclosed. The office’s creation points to a more aggressive role for the Pentagon in countering foreign technology development—not only through conventional military preparations, but also through covert action aimed at programs Washington judges strategically dangerous. The available information does not identify which countries or technologies are targeted. That secrecy leaves basic questions unanswered: how TSO’s activities are authorized, what safeguards govern them and how lawmakers are informed. Covert programs can protect sensitive operations, but they also make clear oversight especially important when government action reaches beyond U.S. borders. The Pentagon has not publicly offered details about the office or its activities.