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Shielding Any material or obstruction, which absorbs (or attenuates) radiation and thus
tends to protect personnel or materials from the effects of a nuclear explosion. A
moderately thick layer of any opaque material will provide satisfactory shielding
from thermal radiation, but a considerable thickness of material of high density
may be needed for nuclear radiation shielding. Electrically continuous housing
for a facility, area, or component, attenuates impinging electric and magnetic
fields.
SHIPALT Ship Alteration.
Shoot-Back The technique of defending a space asset by shooting at an attacker.
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264
Shoot-Look-Shoot
(SLS)
A tactic used to achieve Defense Engagement Options (DEOs), such as assured
kill by shooting at the target, looking to see if it was killed, and shooting again, if
necessary, to achieve the kill.
SHORAD Short-Range Air Defense.
Short Range Air
Launch Target
Single-stage, air-launched, solid propellant theater target with threat
representative reentry vehicle.
Short Range
Ballistic Missile
(SRBM)
A ballistic missile with a range capability of 30 km to 1,000 km. (USSPACECOM)
Short Wavelength
Infrared (SWIR)
Thermal radiation emitted by a source in the electromagnetic spectrum
encompassing infrared wavelengths of 0.75 to 3 microns.
SHOTL Simulated Hot Launch (missile engineering term).
shp Shaft Horsepower.
Shrouded RVs Reentry vehicles enclosed in a material designed to shield its thermal and other
characteristics.
SI Special Intelligence.
SI&I Systems Integration and Interoperability.
SIC (1) Silicon Carbide.
(2) Standard Industrial Classification.
SICPS Standard Integrated Command Post Shelter.
SIDAC Single Integrated Damage Assessment Capability.
SIDD System Interface Description Document (US Army term).
Sidelobes Residual EMR surrounding the main beam, which is of weaker power than the
main beam.
SIDPERS Standard Installation Division Personnel System (US Army term).
SIDS Secondary Imagery Dissemination System.
SIE SATKA Integrated Experiment.
SIF (1) System Integration Facility. (2) Selective Identification Feature
SIGINT Signal Intelligence.
Signals Security
(SIGSEC)
The overall program for communication and electronic security.
Signal-to-Noise
Ratio (S/N) (SNR)
Relative power of the signal to the noise in a channel; usually measured in
decibels.
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265
Signature (1) Distinctive type of radiation emitted or reflected by a target, which can be
used to identify that target.
(2) The characteristic pattern of a target displayed by detection and
identification equipment.
Signature
Histories
A list of observed target signature characteristic parameter values as a function
of missile flight time used for target discrimination and kill assessment.
SIGSEC Signals Security.
SIIPT System Integration Integrated Product Team (THAAD Program term).
SIL Systems Integration Laboratory; Sunnyvale, CA.
SIM Simulation.
SIMM Second In-line Memory Module.
Simple Security
Condition
A Bell-LaPadula security model rule allowing a subject read access to an object
only if the security level of the subject dominates the security level of the object.
SIMS Security Information Management System.
Simulation A simulation is a method for implementing a model. It is the process of
conducting experiments with a model for the purpose of understanding the
behavior of the system modeled under selected conditions or of evaluating
various strategies for the operation of the system within the limits imposed by
developmental or operational criteria. Simulation may include the use of analog
or digital devices, laboratory models, or “test bed” sites. Simulations are usually
programmed for solution on a computer; however, in the broadest sense, military
exercises and wargames are also simulations.
Simulator A generic term used to describe a family of equipment used to represent threat
weapon systems in development testing, operational testing, and training. A
threat simulator has one or more characteristics which, when detected by human
senses or man-made sensors, provide the appearance of an actual threat
weapon system with a prescribed degree of fidelity.
SINCGARS Single-Channel and Airborne Radio System.
Single Integrated
Operational Plan
(SIOP)
Plan by which the nuclear strategic offensive forces will retaliate when directed
by the NCA.
Single-Level
Device
A device that is used to process data of a single security level at any one time.
　
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