The Department of Defense (DoD) is a department of the federal government and has three main components: The departments of the Army, Navy, and Air Force. The DoD is housed in the Pentagon building. The department's roles and limits are contained in Title 10 of the US Code. This section of the law has five components: Subtitle A refers to General Military Law, Subtitle B to the Army, Subtitle C to the Navy and the Marine Corps, Subtitle D to the Air Force and Subtitle E to Military Reserves. Important agencies within the DoD include the Defense Information Systems Agency (DISA), National Security Agency (NSA), the Missile Defense Agency, and the Defense Intelligence Agency (DIA). The DoD receives the largest portion of each year's federal discretionary spending budget. 

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Latest Headlines

Latest Headlines

DHA rarely overturns Tricare appeal ruling

The Defense Department's Tricare appeals decisions are overturned by the Defense Health Agency only 15 percent of the time, a June 4 DoD report to Congress says. Out of 124 cases that were appealed and finalized between fiscal 2009 and fiscal 2013, the DHA ruled to fully support the appeal in 106 cases, the report (pdf) says.

Expert panel: DoD needs to revamp process to keep pace with IT products and services

The Department of Defense needs to revamp the way it buys IT products and services, including changing rigid federal regulations, being open to more commercial competition and providing more training to the agency's acquisition workforce, to keep pace with rapid technological changes, an expert panel at the Brookings Institution said recently.

IT and program management grow closer at DoD

The Defense Department's chief information officer and deputy chief management officer will be sharing an even closer relationship as they try to tie technology and management together. Terry Halvorsen, DoD's acting CIO, said he and DCMO David Tillotson are going to be seamless in their approach.

DHS making 'great strides' in better managing IT programs and retaining workforce, CIO testifies

The Department of Homeland Security has made major advancements in managing its IT programs and attracting and retaining its workforce, the agency's chief information officer said during a recent Senate hearing.

Flood of unaccompanied minors across southwestern border forces vast federal response

The massive number of unaccompanied children crossing the southwestern border has federal officials scrambling to provide enough people and space to deal with the crisis.

Report: Risks from climate change accelerating, national security affected

Impacts from climate change will not only affect local communities, but could also harm U.S. military readiness, a group of high-ranking retired military officers concluded in a recent study.

Not challenging DoD network resilience delusional, says CYBERCOM official

When Lt. Gen. Jon Davis, deputy commander for Cyber Command, arrived at CYBERCOM the focus was on keeping networks operational, not on challenging the network's resilience to an advanced persistent threat. The "red team" was never allowed to go after the Defense Department network in exercises, said Davis.

Halvorsen vows to push DoD to commercial solutions for cloud, data storage

The Defense Department's acting chief information officer wants the department to be more creative in how it uses commercial data solutions. "That means that there's almost no data storage, data transmission, data exchange scenario we won't use," said Terry Halvorsen, DoD's acting CIO.

Separate cyber force not needed, says Navy official

While the Defense Department has grown fond of referring to cyberspace as the new, fourth operational venue – along with sea, air and land – it does not warrant its own, independent branch of the armed services, said Vice Adm. Ted Branch, director of Naval Intelligence.

House Appropriations approves DoD spending bill

The Defense Department would see nearly $500 billion in discretionary funding in fiscal 2015 under a bill passed by the House Appropriations Committee June 10. The $491 billion spending bill (pdf) would increase DoD appropriations by $4.1 billion over the fiscal 2014 enacted level and $200 million more than President Obama's request.