Appointment in the
Oval Office in June 2010. , Sec. Mabus, and Adm.
Gary Roughead testify before Congress in February 2010. , Adm.
John M. Richardson, Sec. Mabus, Deputy Sec. of Defense
Robert O. Work, and Gen.
Robert Neller at the 117th
Army–Navy Game in December 2016. In 2008 Mabus campaigned for Democratic presidential candidate
Barack Obama in Mississippi, who was subsequently elected President of the United States. On March 27, 2009, Mabus was nominated by Obama to be appointed
Secretary of the Navy. He was sworn in on May 19, 2009, and held a ceremonial swearing in at
Washington Navy Yard on June 18, 2009, where he was re-sworn in by the Secretary of Defense
Robert Gates.
Great Green Fleet Several months after taking office, Mabus declared that he wanted to originate half of all of the Navy's power needs from non-petroleum sources by 2020. As part of this, he declared that a number of ships would be covered under a "Great Green Fleet" initiative in which half of them would be partly powered by sources other than
fossil fuels. The Navy experimented with
biofuels during his tenure, though their high expense often garnered skepticism, In April 2010 a furor arose when it was reported that Mabus made the proposal to name a United States Navy warship the after the late Pennsylvania Democratic congressman
John Murtha. Additional naming controversies occurred due to the naming of the auxiliary ship after civil rights activist
Cesar Chavez and a littoral combat ship the in honor of former Arizona Democratic Congresswoman
Gabby Giffords, after she suffered life-threatening wounds in the
2011 mass shooting in her home district of
Tucson,
Arizona. Subsequent ship namings include his January 6, 2016, announcement of his naming of another auxiliary ship after civil rights activist and sitting incumbent Georgia Democratic Congressman
John Lewis (i.e., ). Mabus further stated that this particular class of auxiliary ship, of which the
John Lewis would be the lead ship, would all be named after civil rights leaders. In April he announced his plans to name a destroyer after former
Senate Armed Services Committee chairman
Carl Levin. Congressional Republicans accused Mabus of politicizing the ship-naming process, and Representative
Steven Palazzo unsuccessfully attempted to amend a defense appropriation bill to bar the secretary from naming ships after congressmen who were not military service members. On July 14, 2016, Mabus named ship
T-AO-206 after
gay rights icon and San Francisco Democratic politician
Harvey Milk. The ship was renamed in 2025, as part of the Trump administration's
rollback of DEI policies and programs.
Gulf Coast recovery In June 2010, Obama ordered Mabus to draft a long-term plan to restore the condition of the
Gulf Coast in the aftermath of the
Deepwater Horizon oil spill. Some regional businessmen and environmentalists were critical of the assignment, being troubled by Mabus' previous investments in energy trading companies and worried that as the secretary of navy, he would not be able to devote his full attention to the cleanup effort. He introduced a recovery plan in September which received bipartisan support in Congress. Based on his recommendations, Congress subsequently passed the
RESTORE Act, allocating over $5 billion to rehabilitate the coast.
Budget disputes After a January 2015 report by the
Defense Business Board and
McKinsey & Company discovered the U.S. Department of Defense was spending $134 billion—23% of its total budget—on back-office work, and that the back-office bureaucracy staff of over one million people was nearly as great as the number of active troops, the board recommended a plan to cut $125 billion in waste over five years. However, when
Ash Carter became defense secretary the next month, he replaced the board chairman, the McKinsey results were classified as secret, and its report was removed from public websites. Mabus then gave a speech at the
American Enterprise Institute highlighting the McKinsey report, calling the back-office costs "pure overhead" and particularly criticizing the
Defense Finance and Accounting Service and the
Defense Logistics Agency. Throughout his tenure, Mabus contracted the building of 86 ships for the navy. In 2016 he drafted a budget for the navy for the 2018 fiscal year, which included billions of dollars earmarked for building dozens of additional ships. Carter's draft budget for the Department of Defense did not reflect this appropriation, and in December 2016 Mabus released a memo stating that he did not wish to cut money from shipbuilding, citing the decline in the size of the navy from 2001 to 2008. He also told Carter that "you and I both know that this budget is almost totally a symbolic one," making note of the impending end of Obama's tenure. Mabus also pushed for the introduction of unisex uniforms in the Navy and the
United States Marine Corps. In July 2015 he expanded the
maternity leave of Navy Department personnel to 18 weeks, though Carter later trimmed this to 12 weeks across all armed forced in January 2016.
Departure Mabus declared in March 2016 that he would consider retirement and stepped down as Secretary of the Navy on January 20, 2017, upon the inauguration of President
Donald Trump. He was succeeded by Assistant Navy Secretary
Sean Stackley, who became acting secretary pending the confirmation of a new permanent secretary. Mabus was one of only a few national security officials to serve continuously during Obama's entire tenure ==Awards, honors, community service==