Government Agency Profile

Department of Defense

TypeCabinet Level Department
Established1947
Public ServicesFind support resources for service members, families,
Official Sitedefense.gov

What Visitors Should Know

Learn how the Department of Defense works, what public-facing services, records, or data it provides, and where visitors can verify official source links.

The Department of Defense provides for national defense through the Army, Navy, Air Force, Marine Corps, Space Force, combatant commands, defense agencies, civilian leadership, procurement systems, and support for service members and families. This profile explains the agency in practical terms: what it is responsible for, how people may encounter it, and which public-facing records or services matter most.

Visitors often use Defense-related sources for military family support, TRICARE, installation information, defense records, contracts, Act, the federal law that lets the public request many agency records.">FOIA requests, casualty notices, and official statements on defense operations. Use Defense.gov, service-branch sites, TRICARE, Military OneSource, contracting portals, Federal Register notices, and DoD FOIA channels to verify current benefits, policies, records, and public statements. When legal precision, benefits, applications, deadlines, or compliance rules matter, use those official sources before relying on a summary.

What Defense Does

The Department of Defense provides for national defense through the Army, Navy, Air Force, Marine Corps, Space Force, combatant commands, defense agencies, civilian leadership, procurement systems, and support for service members and families. Visitors often use Defense-related sources for military family support, TRICARE, installation information, defense records, contracts, FOIA requests, casualty notices, and official statements on defense operations. Use official source links for current forms, deadlines, eligibility rules, data, legal notices, public records, and contact channels.

Public ServicesFind support resources for service members, families, and military life.
Benefits and AssistanceUse TRICARE and related health-benefit information when eligible.
Programs and OfficesReview defense contracts, budget materials, rules, and policy releases.
Data and RecordsFind official FOIA, records, installation, and service-branch source links.

How It Fits In Government

Executive DepartmentDepartment of Defense is a Cabinet-level executive department. Its leader is nominated by the President, usually confirmed by the Senate, and responsible for carrying out laws in a major policy area.
Public AccountabilityIts work may appear through official notices, regulations, reports, data systems, service portals, hearings, inspections, grants, enforcement actions, or public contact channels.
Where To VerifyUse the official agency website first for current forms, deadlines, leadership, program rules, contact information, and legal notices.

Public Service Guide

How visitors may use Defense

This profile is designed to help visitors find practical government services, not just describe the agency in the abstract. Start with the official sources below, then use related public service links when a specific form, record, benefit, complaint, data tool, or office is needed.

Public Services Visitors May Need

Military OneSourceOpen official sourceTRICAREOpen official sourceDoD FOIAOpen official sourceDefense official websiteOpen official sourceFederal Register documentsOpen official sourceRegulations.gov searchOpen official sourceUSAspending searchOpen official sourceFOIA.gov agency searchOpen official source

Budget, Records, and Public Accountability

Agency work can also show up in official records: rules, notices, spending data, public comments, reports, grants, enforcement actions, or FOIA/public-record systems. Use these sources to move from a plain-English profile to the official record trail.

Federal Register documentsSearch official notices, rules, proposed rules, and presidential or agency documents.Regulations.gov docketsFind rulemaking dockets, supporting materials, and public comment opportunities.USAspending searchSearch federal awards, grants, contracts, loans, and spending records.FOIA.gov agency searchFind public-record request routes and FOIA contact information.

Learn More

Official records and updatesLook for current announcements, notices, rulemaking, public data, forms, and contact information directly from official sources.
Related servicesMany agency services connect to benefits, taxes, passports, safety, records, grants, complaints, inspections, research, or public information requests.
When to use this profileUse this page to understand what the agency does, then follow official links for applications, deadlines, eligibility rules, data, and legal text.

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