At the federal level, there are numerous agencies which maintain fire services:
BLM (Bureau of Land Management)
NFS (National Forest Service)
NPS (National Park Service)
FEMA (Reserve engines, usually staffed with state or local firefighters, used for large crises)
Firefighting agencies vary by the jurisdictions they cover. For instance, the department nearest your house is likely a city funded local district fire department. If you live in an unincorporated area, a County agency is likely responsible for fire coverage of your home. There are larger state firefighting agencies that deal with emergencies on state lands and parks, as well as departments attached to the National Park Service which cover national parks.
At the federal level, there are numerous agencies which maintain fire services:
BLM (Bureau of Land Management)
NFS (National Forest Service)
NPS (National Park Service)
FEMA (Reserve engines, usually staffed with state or local firefighters, used for large crises)
In large emergencies, a common setup once state and federal agencies arrive to bolster the local first response forces is to have what's called a Joint Command, usually comprising a state fire official and a federal representative.
There are three branches of government: the executive branch, the judicial branch, and the legislative branch. The Department of Justice belongs to the executive branch.
executive
US TREASURYExecutiveLegislativeJudicial TeTe
The US Tax Courts are part of the Legislative Branch of government, but support the IRS and the Department of the Treasury, which are part of the Executive Branch of government.
The FBI is part of the Department of Justice, which is part of the Executive Branch of the United States federal government.
executive
US Department of Justice
All of these departments belong to the executive branch.
The State Department is part of the executive branch of government. They are responsible for executing the President's and the countries foreign policy and managing relations with other countries.
BATFE is part of the United States Department of Justice.
The United States Department of the Treasury is in charge of proposing new currency. It is part of the Executive Branch.
The IRS (Internal Revenue Service) is part of the Federal government. It is an agency of the Treasury Department, which is part of the Executive Branch of the US Federal government.