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maintain track files.
Traffic Decoy Decoy that matches RV characteristics in the exoatmosphere and high
endoatmosphere.
Train Threat geometry with objects placed in a line (string) along the velocity vector of
reentry.
Trajectory The curve described by an object moving through space.
Trajectory
Histories
Trajectory information on targets recorded over a period of time.
TRAK A data base management system (not an acronym).
Trans-Attack Period from first tactical indication of attack until termination started, i.e., postattack.
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305
TRANSCOM [U.S.] Transportation Command, Scott AFB, IL.
TRANSEC Transmission Security.
Transition The period in which the world strategic balance would shift from offensedominance
to defense-dominance.
Transition to
Production
A risk reduction process during which the program shifts (passes) from
development to production. It is not an exact point, but is described as a
process consisting of disciplined engineering and logistics management to
ensure the system is ready for manufacture. (See DoD 4245.7-M.)
Transmission
Security
(TRANSEC)
That component of security, which results from all measures, designed to protect
communications transmissions from interception and traffic analysis. (See
COMSEC.)
Transonic Of or pertaining to the speed of a body in a surrounding fluid when the relative
speed of the fluid is subsonic in some places and supersonic in others. This is
encountered when passing from subsonic to supersonic speeds and vice versa.
Transponder A receiver-transmitter that will generate a reply signal upon proper interrogation.
TRAP Tactical Receiver and Related Applications.
Trap Door A hidden software or hardware mechanism that permits system security
mechanisms to be circumvented.
Traveling Wave
Tube (TWT)
An electronic tube in which a stream of electrons interact continuously or
repeatedly with a guided electromagnetic wave moving substantially in
synchronism with it, in such a way that there is a net transfer of energy from the
stream to the wave; the tube is used as an amplifier or oscillator at frequencies in
the microwave region.
Traverse (1) To turn a weapon to the right or left on its mount.
(2) A method of surveying in which lengths and directions of lines between
points on the earth are obtained by or from field measurements, and
used in determining positions of the points.
Traverse Level That vertical displacement above low-level air defense systems, expressed both
as a height and altitude, at which aircraft can cross the area.
TRB Tactical Review Board.
TRD Technical Requirements Document.
TRE Tactical Receive Equipment.
TREA Transmit/Receive Element Array (THAAD).
TREE Transient Radiation Effects on Electronics.
TREM Total Radiation Environment Model.
TREPS See Thrusted Replicas.
TRESIM Tactical Receive Equipment Simulator.
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306
TRG Threat Reference Guide.
TRI-TAC Tri-Service Tactical Digital Communications System.
TRIDENT Class of US ballistic missile submarines (USN term).
TRIDENT I (C-4) US SLBM (USN term).
TRIDENT II (D-5) US SLBM (USN term).
TRIM Toxic Reduction Investment and Management.
TRM Technical Reference Model.
TRMP Test Resources Management Plan.
TRN (1) Task Requirements Notice. (2) Test Requirements Notification.
Trojan Horse A computer program with an apparently or actually useful function that contains
additional (hidden) functions that surreptitiously exploit the legitimate
authorizations of the invoking process to the detriment of security or mission
performance.
TROPO Tropospheric Scatter.
Tropopause The imaginary boundary layer dividing the stratosphere from the lower part of the
atmosphere, the troposphere. The tropopause normally occurs at an altitude of
about 7.62km to 13.71km in polar and temperate zones, and at 16.76km in the
tropics. (See Stratosphere, Troposphere.)
Troposphere The region of the atmosphere, immediately above the earth's surface and up to
the tropopause, in which the temperature falls fairly regularly with increasing
altitude, clouds form, convection is active, and mixing is continuous and more or
less complete.
Tropospheric
Scatter
The propagation of electromagnetic waves by scattering as a result of
irregularities in the physical properties of the troposphere.
TRP (1) Test Readiness Program. (2) Technology Reinvestment Program.
(3) Technology Readiness Program (pre-acquisition program status).
(4) Technical Requirements Package.
TRPC Technology Readiness Planning Committee.
TRR Test Readiness Review.
　
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