The precipitation to Earth of radioactive particulate matter from a nuclear cloud; also applied to the particulate matter itself. (Source: DOD)

Federal Bureau of Investigation.

Federal Communications Commission (United States).

See: Federal Communications Commission (FCC).

Federal Deposit Insurance Corporation (United States).

See: Federal Deposit Insurance Corporation (FDIC).

Fire Department of New York.

The U.S. Federal Communications Commission (FCC).

The U.S. Federal Deposit Insurance Corporation (FDIC).

The U.S. Federal Trade Commission (FTC).

The U.S. Federal Witness Security Program.

Florida Flight Training Center.

Foreign Intelligence Surveillance Act.

Foreign Intelligence Surveillance Court.

A category of precedence reserved for initial enemy contact messages or operational combat messages of extreme urgency. Brevity is mandatory. (Source: DOD)

The line connecting the successive positions occupied, or to be occupied, by an aircraft, missile, or space vehicle as it moves through air or space. (Source: DOD)

Specified information provided to air traffic services units relative to an intended flight or portion of a flight of an aircraft. (Source: DOD)

Freedom of Information Act.

Information relating to capabilities, intentions, and activities of foreign powers, organizations, or persons, but not including counterintelligence, except for information on international terrorist activities. (Source: DOD)

Foreign Terrorist Organizations (FTO) are groups operating outside the United States that plan and conduct acts of terrorism on both domestic and foreign targets. FTO's are designated by the U.S. Secretary of State.

In casualty reporting, a casualty circumstance applicable to persons killed in action or wounded in action mistakenly or accidentally by friendly forces actively engaged with the enemy, who are directing fire at a hostile force or what is thought to be a hostile force. (Source: DOD)

See: Federal Trade Commission (FTC).

Foreign Terrorist Organization.

See: Foreign Terrorist Organization (FTO).