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Military glossary - Letter H



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Half-residence time
(DOD, NATO) As applied to delayed fallout, it is the time required for the amount of weapon debris deposited in a particular part of the atmosphere to decrease to half of its initial value.

Handover/crossover
(DOD) In evasion and recovery operations, the transfer of evaders between two recovery forces.

Hard missile base
(DOD, NATO) A launching base that is protected against a nuclear explosion.

Harmful appreciations
See appreciations.

Hasty breaching
(DOD, NATO) The rapid creation of a route through a minefield, barrier, or fortification by any expedient method.

Hawkeye
(DOD) A twin turboprop, multicrew airborne early warning and interceptor control aircraft designed to operate from aircraft carriers. It carries a long-range radar and integrated computer system for the detection and tracking of airborne targets at all altitudes. Designated as E-2.

Head-up display
(DOD) A display of flight, navigation, attack, or other information superimposed upon the pilot's forward field of view.

Heavy antitank weapon
(DOD) A weapon capable of operating from ground or vehicle, used to defeat armor and other material targets.

Heavy-lift cargo
(DOD) 1. Any single cargo lift, weighing over 5 long tons, and to be handled aboard ship. 2. In Marine Corps usage, individual units of cargo that exceed 800 pounds in weight or 100 cubic feet in volume.

Helicopter approach route
(DOD, NATO) The track or series of tracks along which helicopters move to a specific landing site or landing zone.

Helicopter support team
(DOD, NATO) A task organization formed and equipped for employment in a landing zone to facilitate the landing and movement of helicopter-borne troops, equipment and supplies, and to evacuate selected casualties and enemy prisoners of war.

HERO SAFE ordnance
(DOD) Any ordnance item that is percussion initiated, sufficiently shielded or otherwise so protected that all electro-explosive devices contained by the item are immune to adverse effects (safety or reliability) when the item is employed in its expected radio frequency environments, provided that the general hazards of electromagnetic radiation to ordnance requirements defined in the hazards from electromagnetic radiation manual are observed.

High altitude low opening parachute technique
(DOD) A method of delivering personnel, equipment, or supplies from airlift aircraft which must fly at altitudes above the threat umbrella..

High-risk-of-capture personnel
(DOD) US personnel whose position or assignment makes them particularly vulnerable to capture by hostile forces in combat, by terrorists, or by unfriendly governments.

High value airborne asset protection
(DOD) A defensive counterair mission which defends airborne national assets which are so important that the loss of even one could seriously impact US warfighting capabilities or provide the enemy with significant propaganda value. Examples of high value airborne assets are Airborne Warning and Control System, Rivet Joint, Joint Surveillance and Target Attack Radar System, and Compass Call. Also called HVAA protection.

High-water mark
(DOD) Properly, a mark left on a beach by wave wash at the preceding high water. It does not necessarily correspond to the high-water line. Because it can be determined by simple observation, it is frequently used in place of the high-water line, which can be determined only by a survey. When so used, it is called the high-water line.

HNS
See host-nation support.

Holding pattern mode
(DOD) Automatic control of an aircraft to fly the programmed holding pattern.

Horizontal action mine
(DOD, NATO) In land mine warfare, a mine designed to produce a destructive effect in a plane approximately parallel to the ground.

Horizontal stowagee
(DOD) The lateral distribution of unit equipment or categories of supplies so that they can be unloaded simultaneously from two or more holds.

Hostage
(DOD) A person held as a pledge that certain terms or agreements will be kept. (The taking of hostages is forbidden under the Geneva Conventions, 1949.)

Hostile environment
See operational environment.

Hot photo interpretation report
(DOD) A preliminary unformatted report of significant information from tactical reconnaissance imagery dispatched prior to compilation of the Initial Photo Interpretation Report. It should pertain to a single objective, event, or activity of significant interest to justify immediate reporting.

Hound Dog
(DOD) A turbojet-propelled, air-to-surface missile designed to be carried externally on the B-52. It is equipped with a nuclear warhead and can be launched for either high or low altitude attacks against enemy targets, supplementing the internally carried firepower of the B-52. Designated as AGM-28B.

Hovering ceiling
(DOD, NATO) The highest altitude at which the helicopter is capable of hovering in standard atmosphere. It is usually stated in two figures: hovering in ground effect and hovering out of ground effect.

Humanitarian and civic assistance
(DOD) Assistance to the local populace provided by predominantly US forces in conjunction with military operations and exercises. This assistance is specifically authorized by title 10, United States Code, section 401, and funded under separate authorities. Assistance provided under these provisions is limited to (1) medical, dental, and veterinary care provided in rural areas of a country; (2) construction of rudimentary surface transportation systems; (3) well drilling and construction of basic sanitation facilities; and (4) rudimentary construction and repair of public facilities. Assistance must fulfill unit training requirements that incidentally create humanitarian benefit to the local populace.

Hydrofoil patrol craft
(DOD) A patrol combatant, missile, fast surface patrol craft, capable of quick reaction and offensive operations against major enemy surface combatants. Designated as PHM.

Hypergolic fuel
(DOD, NATO) Fuel which will spontaneously ignite with an oxidizer, such as aniline with fuming nitric acid. It is used as the propulsion agent in certain missile systems.

Hyperstereoscopy
(DOD, NATO) Stereoscopic viewing in which the relief effect is noticeably exaggerated, caused by the extension of the camera base.

Hypsometric tinting
(DOD, NATO) A method of showing relief on maps and charts by coloring in different shades those parts which lie between selected levels.