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Military glossary - Letter F


(DOD) A twin-engine, supersonic, turbofan, all-weather tactical fighter. It is capable of employing nuclear and nonnuclear weapons. It also has the capability for operating from very short, relatively unprepared air strips.

Facility substitutes
(DOD) Items such as tents and prepackaged structures requisitioned through the supply system that may be used to substitute for constructed facilities.

Fallout contours
(DOD, NATO) Lines joining points which have the same radiation intensity that define a fallout pattern, represented in terms of roentgens per hour.

Fallout safe height of burst
(DOD) The height of burst at or above which no militarily significant fallout will be reproduced as a result of a nuclear weapon detonation.

Farm gate type operations
(DOD) Operational assistance and specialized tactical training provided a friendly foreign air force by the United States Armed Forces to include, under certain specified conditions, the flying of operational missions in combat by combined United States/foreign aircrews as a part of the training being given when such missions are beyond the capability of the foreign air force.

Feasibility test
(DOD) An operation plan review criteria to determine whether or not a plan is within the capacity of the resources that can be made available. See also logistic implications test.

See forward edge of the battle area.

See flame field expedients.

Field artillery observer
(DOD) A person who watches the effects of artillery fire, adjusts the center of impact of that fire onto a target, and reports the results to the firing agency.

Field press censorship
(DOD) The security review of news material subject to the jurisdiction of the Armed Forces of the United States, including all information or material intended for dissemination to the public.

Fighting Falcon
(DOD) A single engine, supersonic, turbofan, all-weather multipurpose tactical fighter/bomber. It is capable of employing nuclear/nonnuclear weapons. Air superiority is its primary mission with air interdiction and close air support as secondary. An air refueling capability increases its flexibility. Designated as F-16.

See Stinger.

Final protective fire
(DOD, NATO) An immediately available prearranged barrier of fire designed to impede enemy movement across defensive lines or areas.

Fire capabilities chart
(DOD, NATO) A chart, usually in the form of an overlay, showing the areas which can be reached by the fire of the bulk of the weapons of a unit.

Fire for effect
See call for fire.

Firepower umbrella
(DOD, NATO) An area of specified dimensions defining the boundaries of the airspace over a naval force at sea within which the fire of ships' antiaircraft weapons can endanger aircraft, and within which special procedures have been established for the identification and operation of friendly aircraft.

Fire support coordinating measure
(DOD) A measure employed by land or amphibious commanders to facilitate the rapid engagement of targets and simultaneously provide safeguards for friendly forces.

Fire task
See fire mission.

First salvo at
(DOD) In naval gunfire support, a portion of a ship's message to an observer or spotter to indicate that because of proximity to troops, the ship will not fire at the target but offset the first salvo a specific distance from the target.

Fission to yield ratio
(DOD, NATO) The ratio of the yield derived from nuclear fission to the total yield; it is frequently expressed in percent.

Fixed station patrol
(DOD, NATO) One in which each scout maintains station relative to an assigned point on a barrier line while searching the surrounding area. Scouts are not stationary but remain underway and patrol near the center of their assigned stations. A scout is a surface ship, submarine, or aircraft.

Flash blindness
(DOD, NATO) Impairment of vision resulting from an intense flash of light. It includes temporary or permanent loss of visual functions and may be associated with retinal burns.

Flash-to-bang time
(DOD, NATO) The time from light being first observed until the sound of the nuclear detonation is heard.

Fleet ballistic missile submarine
(DOD) A nuclear-powered submarine designed to deliver ballistic missile attacks against assigned targets from either a submerged or surfaced condition. Designated as SSBN.

Flexible Deterrent Option
(DOD) A planning construct intended to facilitate early decision by laying out a wide range of interrelated response paths that begin with deterrent-oriented options carefully tailored to send the right signal. The Flexible Deterrent Option is the means by which the various deterrent options available to a commander (such as economic, diplomatic, political, and military measures) are implemented into the planning process.

Flight operations center
(DOD) The element of the tactical Army air traffic regulation system which provides for aircraft flight following, separation of aircraft under instrument conditions, and identification of friendly aircraft to friendly air defense agencies.
Flight readiness firing
(DOD) A missile system test of short duration conducted with the propulsion system operating while the missile is secured to the launcher. Such a test is performed to determine the readiness of the missile system and launch facilities prior to flight test.

Floating reserve
(DOD, NATO) In an amphibious operation, reserve troops which remain embarked until needed.

Fly(ing) at speed
(DOD) In air intercept, a code meaning, "Fly at (mach__/__) indicated air speed," or, "My indicated air speed is (__ knots/mach __)."

See forward operating base; forward operations base.

Follow-up echelon
(DOD, NATO) In air transport operations, elements moved into the objective area after the assault echelon.

Force requirement number
(DOD) An alphanumeric code used to uniquely identify force entries in a given operation plan time-phased force and deployment data.

Force structure
See military capability.

Foreign instrumentation signals intelligence
(DOD) Technical and intelligence information derived from the intercept of foreign electromagnetic emissions associated with the testing and operational deployment of non-US aerospace, surface, and subsurface systems. Foreign instrumentation signals intelligence is a subcategory of signals intelligence. Foreign instrumentation signals include, but are not limited to, telemetry, beaconry, electronic interrogators, and video data links.

(DOD) That portion of a beach extending from the low water (datum) shoreline to the limit of normal high water wave wash.

Formerly restricted data
(DOD) Information removed from the Restricted Data category upon a joint determination by the Department of Energy (or antecedent agencies) and Department of Defense that such information relates primarily to the military utilization of atomic weapons and that such information can be adequately safeguarded as classified defense information. (Section 142d, Atomic Energy Act of 1954, as amended.)

Forward aeromedical evacuation
(DOD, NATO) That phase of evacuation which provides airlift for patients between points within the battlefield, from the battlefield to the initial point of treatment, and to subsequent points of treatment within the combat zone.

Forward slope
(DOD, NATO) Any slope which descends towards the enemy.

Fox away
(DOD) In air intercept, a code meaning, "Missile has fired or been released from aircraft."

Free air overpressure
(DOD, NATO) The unreflected pressure, in excess of the ambient atmospheric pressure, created in the air by the blast wave from an explosion.

Frequency deconfliction
(DOD) A systematic management procedure to coordinate the use of the electromagnetic spectrum for operations, communications, and intelligence functions. Frequency deconfliction is one element of electromagnetic spectrum management.

Fulton Recovery System
(DOD) A method used for quickly extracting personnel from isolated areas that consists of a kit containing a harness, tow line, and helium-inflated balloon dropped to an individual(s) by a specially designed aircraft that is capable of snaring the tow line and extracting the harnessed individual(s) from the area.

Fuze (specify
(DOD) In artillery and naval gunfire support, a command or request to indicate the type of fuze action desired; i.e., delay, quick, time, proximity.