FM 101-5-1
Operational Terms and Graphics

Chapter 1


GA - the symbol for the nerve agent tabun. See FM 3-9.

gap (JP 1-02, NATO) - An area within a minefield or obstacle belt, free of live mines or obstacles, whose width and direction will allow a friendly force to pass through in tactical formation. (Army) - 1. Any break or breach in the continuity of tactical dispositions or formations beyond effective small arms coverage. 2. A portion of a minefield of specified width in which no mines have been laid to enable a friendly force to pass through in tactical formation. 3. A ravine, mountain pass, or river that presents an obstacle that must be bridged. (See also lane.) See FMs 5-100, 7-7, 7-8, 7-10, 7-20, 7-30, 34-130, 71-100, 71-123, and 90-13-1.

GB - the symbol for the nerve agent sarin. See FM 3-9.

GD - the symbol for the nerve agent soman. See FM 3-9.

general support (GS) (JP 1-02, NATO) - That support which is given to the supported force as a whole and not to any particular subdivision thereof. (See also direct support (DS) and general support-reinforcing (GSR).) See FMs 6-20 series and 10-1.

general support artillery (JP 1-02, NATO) - Artillery which executes the fire directed by the commander of the unit to which it organically belongs or is attached. It fires in support of the operation as a whole rather than in support of a specific subordinate unit. (See also direct support artillery, general support-reinforcing (GSR), and reinforcing.) See FM 6-20 series.

general support-reinforcing (GSR) (JP 1-02) - A tactical artillery mission. General support-reinforcing artillery has the mission of supporting the force as a whole and of providing reinforcing fires for another artillery unit. (See also direct support (DS), general support (GS), and reinforcing.) See FM 6-20 series.

general war (JP 1-02) - Armed conflict between major powers in which the total resources of the belligerents are employed, and the national survival of a major belligerent is in jeopardy. (See also conflict, military operations other than war (MOOTW), and stability and support operations (SASO).)

germ - A disease producing microorganism, microbe, or pathogenic bacterium. The term includes bacteria, rickettsiae, viruses, and fungi. (See also decontamination.) See FMs 3-4 and 3-9.

global information environment (GIE) (Army) - Individuals, organizations, and systems, outside the sphere of military or National Command Authorities control, that gather, process, or disseminate information to national and international audiences. See FM 100-6.

global positioning system (GPS) - A satellite-based system used for accurate positioning and navigation. (See also way point.) See FM 21-26.

graphic (JP 1-02, NATO) - Any and all products of the cartographic and photogrammetric art. A graphic may be a map, chart, or mosaic or even a film strip that was produced using cartographic techniques. (Army) - A hand-drawn or computer-generated picture or symbol that represents units, equipment, suspected or templated enemy units and sites, sites or facilities, control measures, and so forth. Term relates to the design, creation, and preparation of two- or three-dimensional visual products. See AR 25-1.

graves registration (Army) - A subprogram of mortuary affairs that provides for search, recovery, initial identification, and temporary burial of deceased personnel in temporary burial sites and provides maintenance and care of burial sites and the handling and disposition of personal effects.

gray lists - Lists that identify and locate those personalities whose inclinations and attitudes toward the political and military objectives of the United States are obscure. Individuals may be listed on grey lists when they are known to possess information or particular skills required by US forces.

gray water - Any nontoilet water (nonsewage) which is nonpotable because of its having been used in some way (for example, water from sinks, bathtubs, showers, or laundry operation

grazing fire (JP 1-02, NATO) - Fire approximately parallel to the ground where the center of the cone of fire does not rise above 1 meter from the ground. (See also direct fire, final protective line (FPL), and dead space.) See FMs 7-7, 7-8, and 7-10.

Greenwich Mean Time (GMT) (ZULU) - Mean solar time measured at the prime meridian which runs through Greenwich, England. It is used as the basis for calculating time throughout most of the world. (See also Universal Time and ZULU time.) See FM 101-5.

grey propaganda (JP 1-02) - Propaganda that does not specifically identify any source.

grid azimuth - An angle of direction referenced to grid north. It differs from true azimuth by the amount of the grid convergence. (See also azimuth.) See FM 21-26.

grid convergence (JP 1-02) - The horizontal angle at a place between true north and grid north. It is proportional to the longitude difference between the place and the central meridian. (See also grid azimuth and magnetic azimuth.) See FM 21-26.

grid coordinates (JP 1-02, NATO) - Coordinates of a grid coordinate system to which letters and numbers are assigned for use in designating a point on a gridded map, photograph, or chart. (Army) - The easting and northing values (of a grid) that designate the location of a point in respect to the grid. Coordinates usually are expressed to the nearest 100, 10, or 1 meter, with the easting and northing values combined into a single expression. Examples: NK 329378 (nearest 100 meters); NK 32943785 (nearest 10 meters); or NK 3294837853 (nearest 1 meter). See FM 21-26.

grid north (JP 1-02, NATO) - The northerly or zero direction indicated by the grid datum of directional reference. See FM 21-26.

ground combat element (GCE) (JP 1-02) - The Marine air-ground task force (MAGTF) element that is task-organized to conduct ground operations. The GCE is constructed around an infantry unit and varies in size from a reinforced infantry battalion to one or more reinforced Marine division(s). The GCE also includes appropriate combat support and combat service support units. Normally, there is only one GCE in a MAGTF.

ground tactical plan (Army) - An airborne or air assault operational plan covering the conduct of operations in the objective area. (See also echelonment, landing plan, and marshalling plan.) See FMs 7-7, 7-10, 7-20, 7-30, 90-4, 90-26, 71-100-2, and 71-100-3.

ground zero (GZ) (JP 1-02, NATO) - The point on the surface of the Earth at, or vertically below or above, the center of a planned or actual nuclear detonation. (See also desired ground zero (DGZ).) See FMs 3-3-1, 100-30, JPs 3-12.2, and 3-12.3.

group (JP 1-02) - 1. A flexible administrative and tactical unit composed of either two or more battalions or two or more squadrons. The term also applies to combat support and combat service support units. 2. A number of ships and/or aircraft, normally a subdivision of a force, assigned for a specific purpose.

group of targets (JP 1-02, NATO) - Two or more targets on which fire is desired simultaneously. A group of targets is designated by a letter/number combination or a nickname. (See also fire plan.) See FM 6-20 series.

g-series nerve agents - A series of fluorine- or cyanide-containing organophosphate nerve agents (organophosphate derivatives of phosphoric acid). In their unmodified state they are colorless, volatile liquids. (See also GA, GB, and GD.) See FM 3-9.

guard (JP 1-02, NATO) - A security element whose primary task is to protect the main force by fighting to gain time, while also observing and reporting information. (Army) - A form of security operation whose primary task is to protect the main force by fighting to gain time while also observing and reporting information, and to prevent enemy ground observation of and direct fire against the main body by reconnoitering, attacking, defending, and delaying. A guard force normally operates within the range of the main body's indirect fire weapons. (See also cover, flank guard, screen, and security operations.) See FMs 7-30, 17-95, 71-100, 71-123, 100-5, and 100-15.

guerrilla warfare (JP 1-02, NATO) - Military and paramilitary operations conducted in enemy-held or hostile territory by irregular, predominantly indigenous forces. (See also unconventional warfare (UW).) See FMs 90-8, 100-12, and 100-20.

gun-target line (JP 1-02, NATO) - An imaginary straight line from the gun(s) to the target. (See also observer-target line.) See FMs 6-series and 7-90.

Updated 27 July 1997.

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