Military Glossary

IA
See initial assessment; information assurance.

IDAD
See internal defense and development.

Igloo space
(DOD) Area in an earth-covered structure of concrete and/or steel designed for the storage of ammunition and explosives.

Image motion compensation
(DOD, NATO) Movement intentionally imparted to film at such a rate as to compensate for the forward motion of an air or space vehicle when photographing ground objects.

IMINT
See imagery intelligence.

Immediate mission request
(DOD) A request for an air strike on a target which, by its nature, could not be identified sufficiently in advance to permit detailed mission coordination and planning.

Impact action fuze
(DOD, NATO) A fuze that is set in action by the striking of a projectile or bomb against an object, e.g., percussion fuze, contact fuze. Synonymous with direct action fuze.

Improved conventional munitions
(DOD) Munitions characterized by the delivery of two or more antipersonnel or antimateriel and/or antiarmor submunitions by an artillery warhead or projectile.

Inactive aircraft inventory
(DOD) Aircraft in storage or bailment and/or government-furnished equipment on loan or lease outside of the Defense establishment or otherwise not available to the Military Services.

Incident
(DOD) In information operations, an assessed event of attempted entry, unauthorized entry, or an information attack on an automated information system. It includes unauthorized probing and browsing; disruption or denial of service; altered or destroyed input, processing, storage, or output of information; or changes to information system hardware, firmware, or software characteristics with or without the users' knowledge, instruction, or intent.

Indefinite delivery type contract
(DOD) A type of contract used for procurements where the exact time of delivery is not known at time of contracting.

Indicated airspeed hold mode
(DOD) In a flight control system, a control mode in which desired indicated airspeed of an aircraft is maintained automatically.

Indirect laying
(DOD, NATO) Aiming a gun either by sighting at a fixed object, called the aiming point, instead of the target or by using a means of pointing other than a sight, such as a gun director, when the target cannot be seen from the gun position.

Individual mobilization augmentee detachment
(DOD) A dependent not entitled to travel to the overseas command at Government expense or who enters the command without endorsement of the appropriate overseas commander.

Industrial preparedness program
(DOD) Plans, actions, or measures for the transformation of the industrial base, both government-owned and civilian-owned, from its peacetime activity to the emergency program necessary to support the national military objectives. It includes industrial preparedness measures such as modernization, expansion, and preservation of the production facilities and contributory items and services for planning with industry.

Inertial navigation system
(DOD, NATO) A self-contained navigation system using inertial detectors, which automatically provides vehicle position, heading, and velocity.

Influence release sinker
(DOD, NATO) A sinker which holds a moored or rising mine at the sea-bed and releases it when actuated by a suitable ship influence.

Information superiority
(DOD) The capability to collect, process, and disseminate an uninterruped flow of information while exploiting or denying an adversary's ability to do the same.

INFOSEC
See information security.

ING
See Inactive National Guard.

Initial entry into Military Service
(DOD) Entry for the first time into military status (active duty or reserve) by induction, enlistment, or appointment in any Service of the Armed Forces of the United States. Appointment may be as a commissioned or warrant officer; as a cadet or midshipman at the Service academy of one of the armed forces; or as a midshipman, US Naval Reserve, for US Naval Reserve Officers' Training Corps training at a civilian institution.

Initial path sweeping
(DOD, NATO) In naval mine warfare, initial sweeping to clear a path through a mined area dangerous to the following mine sweepers.

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