United States Department of Defense
Executive department of the US federal government
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| 2025 | US Department of Defense submitted a budget request of $849.8 billion for Fiscal Year 2025 (FY2025). |
| May 2 2025 | Two sources reported a decision had been reached to move USSPACECOM to Redstone Arsenal, pending confirmation of a new Secretary of the Air Force. |
| March 2025 | Established the Joint Task Force-Southern Border from the 10th Mountain Division headquarters to oversee joint forces along the 2,000-mile Mexico-United States border, involving approximately 10,000 service members. |
| 2025 | John Phelan became the incumbent Secretary of the Navy during Donald Trump's presidency. |
| March 2025 | The Report on wealth and corrupt activities of the leadership of the Chinese Communist Party, mandated by Marco Rubio in section 6501 of the NDAA, was released after being initially postponed. |
| March 17 2025 | Tim Dill begins performing the duties of Principal Deputy Under Secretary of Defense for Personnel and Readiness |
| March 17 2025 | Austin Dahmer began serving as acting Deputy Under Secretary of Defense for Policy. |
| March 17 2025 | Tim Dill began performing the duties of Deputy Under Secretary of Defense for Personnel and Readiness. |
| March 17 2025 | Stephen Feinberg becomes the 36th Deputy Secretary of Defense, following Robert G. Salesses' acting tenure. |
| March 14 2025 | Scheduled date for the 119th Congress to revisit the Appropriations process for the National Defense Authorization Act (NDAA). |
| March 3 2025 | Katherine Arrington begins serving as Acting Department of Defense Chief Information Officer |
| March 2 2025 | The US Treasury Department announced it would not enforce the federal beneficial ownership disclosure law. |
| February 7 2025 | DoDEA issued a statement announcing the removal of books potentially related to 'gender ideology or discriminatory equity ideology topics', including titles like The Kite Runner, An Indigenous Peoples' History of the United States, and Brave New World. |
| February 3 2025 | Sean Parnell assumes the role of Assistant to the Secretary of Defense (Public Affairs) under Pete Hegseth during the Trump administration. |
| February 2025 | U.S. government issued new guidance to USCYBERCOM, formally pausing offensive cyber operations against Russia. |
| January 2025 | Activated military police and combat engineer units from the Army and Marine Corps to support Customs and Border Patrol on the U.S. southern border. |
| January 24 2025 | Robert Storch departs from the role of Inspector General, succeeded by Steven A. Stebbins in an acting capacity |
| January 23 2025 | The Supreme Court ruled that the Government can enforce the Corporate Transparency Act (CTA) while the Fifth Circuit Court reviews the law. |
| January 22 2025 | Robert E. Thompson appointed as acting Assistant Secretary of Defense (Energy, Installations, and Environment) under President Donald Trump. |
| January 20 2025 | Dane Hughes becomes Acting Assistant Secretary of Defense (Legislative Affairs) under Pete Hegseth during Donald Trump's presidency. |
| January 20 2025 | Steven J. Morani assumes the role of Performing the Duties of Under Secretary of Defense for Acquisition and Sustainment under Secretary of Defense Pete Hegseth during the Donald Trump administration. |
| January 20 2025 | Jules W. Hurst III becomes Acting Assistant Secretary of Defense (Readiness) under potential Secretary of Defense Pete Hegseth during the transition period. |
| January 20 2025 | Bryn Woollacott MacDonnell becomes Acting Under Secretary of Defense (Comptroller) following the transition of administration. |
| January 20 2025 | Dr. Steve Ferrara becomes Acting Assistant Secretary of Defense (Health Affairs) under Secretary of Defense Pete Hegseth during Donald Trump's presidency. |
| January 20 2025 | Dustin Gard-Weiss begins serving as Acting Under Secretary of Defense for Intelligence under Pete Hegseth during the Trump administration. |
| January 20 2025 | President Donald Trump issued an executive order directing the Secretary of Defense to give Northern Command the mission to seal borders and maintain US sovereignty, requiring a revision of the Unified Command Plan within 10 days and a detailed implementation plan from NORTHCOM within 30 days. |
| January 20 2025 | Jules W. Hurst III begins performing the duties of Principal Deputy Under Secretary of Defense for Personnel and Readiness under acting USD(P&R) Darin Selnick, with Pete Hegseth, during President Donald Trump's administration. |
| January 20 2025 | Anne McAndrew began performing the duties of Deputy Under Secretary of Defense (Comptroller). |
| January 20 2025 | Patrick Witt began performing the duties of Deputy Under Secretary of Defense for Research and Engineering. |
| January 20 2025 | Brent G. Ingraham began performing the duties of Deputy Under Secretary of Defense for Acquisition and Sustainment. |
| January 20 2025 | Lloyd Austin completed his term as U.S. Secretary of Defense. |
| 2024 | War Resisters League analysis claims military-related spending comprises 43% of the US federal budget |
| 2024 | United States defense budget reaches $910 billion, marking a continued increase in military spending. |
| 2024 | Sections 1687 and 7343 of the NDAA imposed restrictions on using federal funds or independent research and development (IRAD) indirect expenses for UFO/UAP research, requiring disclosure of materials to appropriate congressional committees and leadership. |
| 2024 | The National Defense Authorization Act for Fiscal Year 2024 was enacted, specifying the budget, expenditures, and policies for the U.S. Department of Defense for the fiscal year. |
| 2024 | Bilyana Anderson becomes the current President of Defense Acquisition University, succeeding James P. Woolsey. |
| 2024 | Aegis Ashore site at Redzikowo, Poland becomes operational |
| 2024 | Patriot PAC-3 successfully tested with the Aegis system. |
| December 2024 | DMSP 5D-2/F14 satellite exploded while in orbit after its decommissioning |
| December 26 2024 | The U.S. Court of Appeals for the Fifth Circuit affirmed the district court's injunction against the beneficial ownership disclosure provisions. |
| December 21 2024 | The Senate approved the Continuing Resolution, preparing it for President Biden's signature into law to maintain government funding for defense and energy operations. |
| December 20 2024 | The House of Representatives approved a Continuing Resolution to fund Department of Defense and Department of Energy operations at FY2024 levels, extending funding until 14 March 2025. |
| December 3 2024 | Judge Amos Mazzant in the U.S. District Court for the Eastern District of Texas issued a nationwide preliminary injunction against the beneficial ownership disclosure provisions, stating the act is likely unconstitutional. |
| July 1 2024 | Leslie Beavers begins serving as Acting Department of Defense Chief Information Officer |
| March 23 2024 | A government shutdown was averted with the signing of a $1.2 trillion bill to cover Fiscal Year 2024. |
| March 1 2024 | Dustin J. Gard-Weiss begins performing the duties of Deputy Under Secretary of Defense for Intelligence and Security |
| February 2024 | DTRA Director Rebecca Hersman announced the agency would transition its intelligence resources and authorities to the Defense Intelligence Agency in her Strategic Intent 2022-2027 document. |
| February 29 2024 | Ronald Moultrie concludes his tenure, and Milancy Harris begins serving as Acting Under Secretary of Defense for Intelligence. |
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This contents of the box above is based on material from the Wikipedia articles Aegis Ballistic Missile Defense System, United States Secretary of the Navy, National Defense Authorization Act for Fiscal Year 2021, Department of Defense Office of Inspector General, Assistant Secretary of Defense for Legislative Affairs, Assistant Secretary of Defense for Networks and Information Integration, Under Secretary of Defense for Personnel and Readiness, Department of Defense Education Activity, United States Cyber Command, United States Deputy Secretary of Defense, Defense Threat Reduction Agency, United States Deputy Under Secretary of Defense, Under Secretary of Defense (Comptroller), Assistant Secretary of Defense for Readiness and Force Management, Defense Meteorological Satellite Program, United States Northern Command, Defense Acquisition University, United States Central Command, Military budget of the United States, National Defense Authorization Act for Fiscal Year 2023, National Defense Authorization Act for Fiscal Year 2024, Under Secretary of Defense for Acquisition and Sustainment, Assistant Secretary of Defense for Energy, Installations, and Environment, Assistant Secretary of Defense for Health Affairs, Assistant to the Secretary of Defense for Public Affairs, Under Secretary of Defense for Intelligence and Security & United States Space Command, which are released under the Creative Commons Attribution-ShareAlike 4.0 International License.